# Clinical Profile ofPlasmodium vivax Malaria in Children and Study of Severity Parameters in relation to Mortality: A Tertiary Care Centre Perspective in Mumbai, India

Authors: Manju Kumari; Radha Ghildiyal
Journal: Malaria Research and Treatment
 (2014)

---

## Abstract

Background. While research on P. vivax is scarce because it is considered benign, it has become evident with implementation of molecular diagnosis that it can also cause multiple organ dysfunction and severe life-threatening disease. Objective. To study clinical presentations and complications of P. vivax malaria and mortality correlation to severity parameters as defined by WHO criteria for severe malaria. Materials and methods. This study was conducted in a tertiary care centre in Mumbai. Confirmed P. vivax cases were enrolled and studied for their clinical profile, and WHO severity parameters were tested for their frequency and association to mortality. Result. The most common presentation was fever followed by pallor. 26% of the cases satisfied one or more criteria of WHO severity parameters. 2 cases died; both had pulmonary edema and bleeding. The major predictor of mortality among these predefined severity criteria was pulmonary edema/ARDS. Patients with severe anemia, circulatory collapse, and repeated generalized convulsion had 100% survival rate. Leukopenia was present in 10% of the cases. Both cases with mortality had leukopenia. Conclusion. P. vivax monoinfection tends to have severe complications in children. There is a need to review severity criteria for P. vivax malaria.


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## Body

## 1. Introduction

Four countries account for more than 80% of estimated cases ofP. vivax cases (Ethiopia, India, Indonesia, and Pakistan). India alone contributes 80% of southeast Asia malaria burden. The risk of severeP. vivax disease in residents of endemic areas has been observed to rise with increasing transmission intensity, although the contribution of less access to care and more comorbidity in these settings is not well quantified. As a result of the slower rate of decrease in the incidence ofP. vivax, many malaria control programs that are moving towards elimination need to give greater attention to the control ofP. vivax, particularly in countries outside sub-Saharan Africa. Indeed,P. vivax predominates in countries in the preelimination and elimination phases [1].P. vivaxmalaria has long been considered to have a benign course with multiple relapses. The typical complications seen inP. falciparummalaria are not usually found inP. vivax monoinfections. However, during the past few years, the trend in the clinical manifestations ofP. vivaxmalaria has been changing [2]. Several isolated studies from India have reported severe complicated cases ofP. vivaxmalaria [3].Although this type of malaria is an enormous burden of disease, research about the disease is scarce probably because of it being considered benign malaria compared toP. falciparum malaria. However, with implementation of molecular diagnosis, it has become evident thatP. vivax monoinfection could also be involved in multiple organ dysfunction and severe life-threatening disease as seen inP. falciparum infection [4, 5].


## 2. Materials and Methods

### 2.1. Setting of Study

A prospective hospital-based clinical observational study was done over 2 years in a pediatric ward of a tertiary care hospital situated in Mumbai, India. A total of 50 patients under age of 12 years were enrolled in the study.


### 2.2. Ethical Issues

The institutional ethical committee approved the study.


### 2.3. Inclusion Criteria

(1)
Children in age group of below 12 years.
(2)
Peripheral smear or rapid malaria antigen test (RMAT) positive forPlasmodium vivax malaria.
(3)
Availability of a written informed consent.


### 2.4. Exclusion Criteria

(1)
Nonavailability of consent.
(2)
Peripheral smear positive forP. falciparum or positive for bothP. falciparum andP. vivax.
(3)
Patient presenting with fever (malarial parasite negative on peripheral smear and/or RMAT negative) but treated empirically like malaria.


### 2.5. Diagnosis

The diagnosis and confirmation of species ofP. falciparum andP. vivax malaria were established by thick and thin film of peripheral blood smear examination under oil immersion with Giemsa stain and RDT. The RDTs were based on detection of specificPlasmodium spp. lactate dehydrogenase and histidine-rich protein 2.Categorization in severe and nonsevere malaria was done on the basis of WHO guidelines for severe malaria.


#### 2.5.1. Initial World Health Organization Criteria from 1990

(i)
Cerebral malaria: unarousable coma nonattributable to any other cause, with a Glasgow Coma Scale score ≤9. Coma should persist for at least 30 min after generalized convulsions.
(ii)
Severe anemia: hematocrit <15% or hemoglobin <50 g/L in the presence of parasite count >10 000/μL.
(iii)
Renal failure: urine output <12 mL/kg/24 hours in children and a serum creatinine >3.0 mg/dL despite adequate volume repletion.
(iv)
Pulmonary edema and acute respiratory distress syndrome.
(v)
Hypoglycemia: whole blood glucose concentration <40 mg/dL.
(vi)
Circulatory collapse (algid malaria): systolic blood pressure <70 mmHg in patients >5 years of age (<50 mmHg in children aged 1.5 years), with cold clammy skin or a core-skin temperature difference >10°C.
(vii)
Abnormal bleeding and/or disseminated intravascular coagulation: spontaneous bleeding from gums, nose, and gastrointestinal tract, or laboratory evidence of disseminated intravascular coagulation.
(viii)
Repeated generalized convulsions: 3 convulsions observed within 24 hours.
(ix)
Acidemia/acidosis: arterial pH <7.25 or acidosis (plasma bicarbonate <15 mmol/L).
(x)
Macroscopic hemoglobinuria: hemolysis not secondary to glucose-6-phosphate dehydrogenase deficiency.


#### 2.5.2. Added World Health Organization Criteria from 2000

(i)
Impaired consciousness: arousable mental condition.
(ii)
Prostration or weakness.
(iii)
Hyperparasitemia: >5% parasitized erythrocytes or >250,000 parasites/μL (in nonimmune individuals).
(iv)
Hyperpyrexia: core body temperature >40°C.
(v)
Hyperbilirubinemia: total bilirubin >2.5 mg/dL.


### 2.6. Data Collection and Analysis

Data regarding patient age, sex, clinical presentation, investigations, and outcome were recorded. Patients were categorized in severe and nonsevere group based on WHO guidelines for classification of severe malaria. Chi square test was performed to test statistical significance of sex distribution in different age buckets. Prevalence of symptoms, signs, severity criteria, lab parameters, and their relation to mortality were studied.


### 2.7. Treatment

Patients were treated according to WHO guidelines for malaria treatment.


## 2.1. Setting of Study

A prospective hospital-based clinical observational study was done over 2 years in a pediatric ward of a tertiary care hospital situated in Mumbai, India. A total of 50 patients under age of 12 years were enrolled in the study.


## 2.2. Ethical Issues

The institutional ethical committee approved the study.


## 2.3. Inclusion Criteria

(1)
Children in age group of below 12 years.
(2)
Peripheral smear or rapid malaria antigen test (RMAT) positive forPlasmodium vivax malaria.
(3)
Availability of a written informed consent.


## 2.4. Exclusion Criteria

(1)
Nonavailability of consent.
(2)
Peripheral smear positive forP. falciparum or positive for bothP. falciparum andP. vivax.
(3)
Patient presenting with fever (malarial parasite negative on peripheral smear and/or RMAT negative) but treated empirically like malaria.


## 2.5. Diagnosis

The diagnosis and confirmation of species ofP. falciparum andP. vivax malaria were established by thick and thin film of peripheral blood smear examination under oil immersion with Giemsa stain and RDT. The RDTs were based on detection of specificPlasmodium spp. lactate dehydrogenase and histidine-rich protein 2.Categorization in severe and nonsevere malaria was done on the basis of WHO guidelines for severe malaria.


### 2.5.1. Initial World Health Organization Criteria from 1990

(i)
Cerebral malaria: unarousable coma nonattributable to any other cause, with a Glasgow Coma Scale score ≤9. Coma should persist for at least 30 min after generalized convulsions.
(ii)
Severe anemia: hematocrit <15% or hemoglobin <50 g/L in the presence of parasite count >10 000/μL.
(iii)
Renal failure: urine output <12 mL/kg/24 hours in children and a serum creatinine >3.0 mg/dL despite adequate volume repletion.
(iv)
Pulmonary edema and acute respiratory distress syndrome.
(v)
Hypoglycemia: whole blood glucose concentration <40 mg/dL.
(vi)
Circulatory collapse (algid malaria): systolic blood pressure <70 mmHg in patients >5 years of age (<50 mmHg in children aged 1.5 years), with cold clammy skin or a core-skin temperature difference >10°C.
(vii)
Abnormal bleeding and/or disseminated intravascular coagulation: spontaneous bleeding from gums, nose, and gastrointestinal tract, or laboratory evidence of disseminated intravascular coagulation.
(viii)
Repeated generalized convulsions: 3 convulsions observed within 24 hours.
(ix)
Acidemia/acidosis: arterial pH <7.25 or acidosis (plasma bicarbonate <15 mmol/L).
(x)
Macroscopic hemoglobinuria: hemolysis not secondary to glucose-6-phosphate dehydrogenase deficiency.


### 2.5.2. Added World Health Organization Criteria from 2000

(i)
Impaired consciousness: arousable mental condition.
(ii)
Prostration or weakness.
(iii)
Hyperparasitemia: >5% parasitized erythrocytes or >250,000 parasites/μL (in nonimmune individuals).
(iv)
Hyperpyrexia: core body temperature >40°C.
(v)
Hyperbilirubinemia: total bilirubin >2.5 mg/dL.


## 2.5.1. Initial World Health Organization Criteria from 1990

(i)
Cerebral malaria: unarousable coma nonattributable to any other cause, with a Glasgow Coma Scale score ≤9. Coma should persist for at least 30 min after generalized convulsions.
(ii)
Severe anemia: hematocrit <15% or hemoglobin <50 g/L in the presence of parasite count >10 000/μL.
(iii)
Renal failure: urine output <12 mL/kg/24 hours in children and a serum creatinine >3.0 mg/dL despite adequate volume repletion.
(iv)
Pulmonary edema and acute respiratory distress syndrome.
(v)
Hypoglycemia: whole blood glucose concentration <40 mg/dL.
(vi)
Circulatory collapse (algid malaria): systolic blood pressure <70 mmHg in patients >5 years of age (<50 mmHg in children aged 1.5 years), with cold clammy skin or a core-skin temperature difference >10°C.
(vii)
Abnormal bleeding and/or disseminated intravascular coagulation: spontaneous bleeding from gums, nose, and gastrointestinal tract, or laboratory evidence of disseminated intravascular coagulation.
(viii)
Repeated generalized convulsions: 3 convulsions observed within 24 hours.
(ix)
Acidemia/acidosis: arterial pH <7.25 or acidosis (plasma bicarbonate <15 mmol/L).
(x)
Macroscopic hemoglobinuria: hemolysis not secondary to glucose-6-phosphate dehydrogenase deficiency.


## 2.5.2. Added World Health Organization Criteria from 2000

(i)
Impaired consciousness: arousable mental condition.
(ii)
Prostration or weakness.
(iii)
Hyperparasitemia: >5% parasitized erythrocytes or >250,000 parasites/μL (in nonimmune individuals).
(iv)
Hyperpyrexia: core body temperature >40°C.
(v)
Hyperbilirubinemia: total bilirubin >2.5 mg/dL.


## 2.6. Data Collection and Analysis

Data regarding patient age, sex, clinical presentation, investigations, and outcome were recorded. Patients were categorized in severe and nonsevere group based on WHO guidelines for classification of severe malaria. Chi square test was performed to test statistical significance of sex distribution in different age buckets. Prevalence of symptoms, signs, severity criteria, lab parameters, and their relation to mortality were studied.


## 2.7. Treatment

Patients were treated according to WHO guidelines for malaria treatment.


## 3. Results

### 3.1. Age Distribution of Cases

In this study most of cases were in the 6–12-year age group (see Table1).Table 1
Age distribution of total cases (N=50).
Age (years)
Number
Percentage
<1
8
16%
1 to 5
12
24%
6 to 12
30
60%
Total
50
100%


### 3.2. Sex Distribution of Cases

See Table2.Table 2
Sex distribution of total cases (N=50).
Sex
Number
Percentage
Female
17
34%
Male
33
66%
Total
50
100%


### 3.3. Age and Sex Distribution

Overall male to female ratio was 1.94 : 1. Male to female ratio was 1 : 1 in <1-year age group; males outnumbered female cases in the age group from 6 to 12 years (male : female = 5 : 1) (see Table3).Table 3
Age and sex distribution of total cases (N=50).
Age(years)
Sex
Total
P value(Chi square test)
Female
Male
<1*
Number
4
4
8
0.37
%
50.0%
50.0%
100.0%
1 to 5*
Number
8
4
12
%
66.7%
33.3%
100.0%
6 to 12
Number
5
25
30
0.0002
%
16.7%
83.3%
100.0%
Total
Number
17
33
50
0.023
%
34.0%
66.0%
100.0%
*<1 year and 1 year to 5 years of age groups have been combined for Chi square test.


### 3.4. Clinical Features

See Table4.Table 4
Distribution of presentations in total cases (N=50).
Features
Number ofcases
Percentage
General
Fever
48
96.0%
Pallor
31
62.0%
Edema
4
8.0%
Body ache
1
2.0%
Respiratory symptoms
18
36.0%
Cough
13
26.0%
Tachypnea
5
10.0%
Gastrointestinal
38
76.0%
Vomiting
24
48.0%
Abdominal pain
7
14.0%
Loose motions
4
8.0%
Abdominal distension
2
4.0%
Anorexia
1
2.0%
Jaundice
0
0.0%
Bleeding
5
10.0%
Bleeding (skin and mucocutaneous)
2
4.0%
Pulmonary bleeding with hematemesis
1
2.0%
Pulmonary hemorrhage
1
2.0%
Hematuria
1
2.0%
Central nervous system
18
36.0%
Headache
9
18.0%
Convulsions
4
8.0%
Altered sensorium
4
8.0%
Diplopia and dizziness
1
2.0%
Hypotonia
1
2.0%
Signs of raised intracranial tension
1
2.0%
Squint
1
2.0%
Imaging (chest X-ray, USG)
Cardiomegaly
2
4.0%
Pleural effusion
2
4.0%
Pulmonary hemorrhage
1
2.0%
Pulmonary edema
1
2.0%
Ascites
1
2.0%


### 3.5. Distribution of Organomegaly

See Table5.Table 5
Distribution of organomegaly among total cases (N=50).
Organomegaly
Number
Percentage (%)
Hepatomegaly
5
10.0%
Splenomegaly
5
10.0%
Hepatosplenomegaly
25
50.0%
No hepatosplenomegaly
15
30.0%
Total
50
100.0%


### 3.6. Severe Disease

WHO has defined severity parameters for malaria, which were tested for our study in terms of their frequency and their association to the outcome in the form of mortality. 13 cases (26%) satisfied one or more criteria of WHO severity parameters and were classified as severe malaria. Clinical and laboratory profile of these cases are presented in Table6.Table 6
Distribution of WHO severity parameters and outcome.
WHO criteria for severe malaria
Number of patients withsevere malaria
Percentage of severemalaria cases (%)(N=13)
Number of casesthat expired
Percentage ofpatients that died (%)
Severe anemia Hb < 5 mg/dL/PCV < 15%
3
23.0
0
0
Raised serum creatinine (>3.0 mg/dL)/Urine output <12 mL/kg/24 hours
0
0
0
0
Pulmonary edema/ARDS
2
15.4
2
100.0
Abnormal bleeding
5
36.5
2
40.0
Hypoglycemia (<40 mg/dL)
0
0
0
0
Repeated generalizedconvulsions (≥3 in 24 hrs)
1
7.7
0
0
Circulatory collapse
2
15.4
0
0
Hyperparasitemia >5%
0
0
0
0
Serum bilirubin >2.5 mg/dL
0
0
0
0
Impaired consciousness/Glasgow Coma Scale <9
4
30.8
1
25.0


### 3.7. Laboratory Parameters Not Included in WHO Criteria among Severe Malaria Cases and Outcome

See Table7.Table 7
Distribution of laboratory parameters not included in WHO criteria among severe malaria cases and outcome.
Sample number
Parameter
Range
Total number
Percentage of total cases
Died
(N=50)
Number
% of cases
1
Total leucocyte count
Leukocytosis (>10000/mm3)
5
10.0%
0
—
Leukopenia (<4000/mm3)
5
10.0%
2
40.0%
Normal(4000–10000/mm3)
40
80.0%
0
—
2
Platelet counts(thousand/mm3)
>150
3
6.0%
0
—
100 to 150
10
20.0%
0
—
50 to 100
24
48.0%
0
—
<50
13
26.0%
2
15.4%
3
Peripheral smear
Positive
49
98.0%
2
4.1%
Negative
1
2.0%
0
—
4
Parasitic index
≤1%
45
90.0%
2
4.5%
>1%
5
10.0%
0
—
5
RMAT
Positive
9
18.0%
0
—
Negative
41
82.0%
2
4.9%
6
SGOT
Raised#
6
12.0%
0
—
Normal
44
88.0%
2
4.6%
7
SGPT
Raised#
4
8.0%
0
—
Normal
46
92.0%
2
4.4%
8
Serum bilirubin
Raised#
1
2.0%
0
—
Normal
49
98.0%
2
4.1%
9
Serum creatinine
Raised(>1.0 mg/dL)
5
10.0%
1
20.0%
<1.0 mg/dL
45
90.0%
1
2.2%
#Based on normal reference range for age and sex.


### 3.8. Outcome

Among the total of 50 cases studied 2 cases died with a case fatality rate of 4%.Among the total of 50 cases studied 10 cases (20%) required ICU admission.


## 3.1. Age Distribution of Cases

In this study most of cases were in the 6–12-year age group (see Table1).Table 1
Age distribution of total cases (N=50).
Age (years)
Number
Percentage
<1
8
16%
1 to 5
12
24%
6 to 12
30
60%
Total
50
100%


## 3.2. Sex Distribution of Cases

See Table2.Table 2
Sex distribution of total cases (N=50).
Sex
Number
Percentage
Female
17
34%
Male
33
66%
Total
50
100%


## 3.3. Age and Sex Distribution

Overall male to female ratio was 1.94 : 1. Male to female ratio was 1 : 1 in <1-year age group; males outnumbered female cases in the age group from 6 to 12 years (male : female = 5 : 1) (see Table3).Table 3
Age and sex distribution of total cases (N=50).
Age(years)
Sex
Total
P value(Chi square test)
Female
Male
<1*
Number
4
4
8
0.37
%
50.0%
50.0%
100.0%
1 to 5*
Number
8
4
12
%
66.7%
33.3%
100.0%
6 to 12
Number
5
25
30
0.0002
%
16.7%
83.3%
100.0%
Total
Number
17
33
50
0.023
%
34.0%
66.0%
100.0%
*<1 year and 1 year to 5 years of age groups have been combined for Chi square test.


## 3.4. Clinical Features

See Table4.Table 4
Distribution of presentations in total cases (N=50).
Features
Number ofcases
Percentage
General
Fever
48
96.0%
Pallor
31
62.0%
Edema
4
8.0%
Body ache
1
2.0%
Respiratory symptoms
18
36.0%
Cough
13
26.0%
Tachypnea
5
10.0%
Gastrointestinal
38
76.0%
Vomiting
24
48.0%
Abdominal pain
7
14.0%
Loose motions
4
8.0%
Abdominal distension
2
4.0%
Anorexia
1
2.0%
Jaundice
0
0.0%
Bleeding
5
10.0%
Bleeding (skin and mucocutaneous)
2
4.0%
Pulmonary bleeding with hematemesis
1
2.0%
Pulmonary hemorrhage
1
2.0%
Hematuria
1
2.0%
Central nervous system
18
36.0%
Headache
9
18.0%
Convulsions
4
8.0%
Altered sensorium
4
8.0%
Diplopia and dizziness
1
2.0%
Hypotonia
1
2.0%
Signs of raised intracranial tension
1
2.0%
Squint
1
2.0%
Imaging (chest X-ray, USG)
Cardiomegaly
2
4.0%
Pleural effusion
2
4.0%
Pulmonary hemorrhage
1
2.0%
Pulmonary edema
1
2.0%
Ascites
1
2.0%


## 3.5. Distribution of Organomegaly

See Table5.Table 5
Distribution of organomegaly among total cases (N=50).
Organomegaly
Number
Percentage (%)
Hepatomegaly
5
10.0%
Splenomegaly
5
10.0%
Hepatosplenomegaly
25
50.0%
No hepatosplenomegaly
15
30.0%
Total
50
100.0%


## 3.6. Severe Disease

WHO has defined severity parameters for malaria, which were tested for our study in terms of their frequency and their association to the outcome in the form of mortality. 13 cases (26%) satisfied one or more criteria of WHO severity parameters and were classified as severe malaria. Clinical and laboratory profile of these cases are presented in Table6.Table 6
Distribution of WHO severity parameters and outcome.
WHO criteria for severe malaria
Number of patients withsevere malaria
Percentage of severemalaria cases (%)(N=13)
Number of casesthat expired
Percentage ofpatients that died (%)
Severe anemia Hb < 5 mg/dL/PCV < 15%
3
23.0
0
0
Raised serum creatinine (>3.0 mg/dL)/Urine output <12 mL/kg/24 hours
0
0
0
0
Pulmonary edema/ARDS
2
15.4
2
100.0
Abnormal bleeding
5
36.5
2
40.0
Hypoglycemia (<40 mg/dL)
0
0
0
0
Repeated generalizedconvulsions (≥3 in 24 hrs)
1
7.7
0
0
Circulatory collapse
2
15.4
0
0
Hyperparasitemia >5%
0
0
0
0
Serum bilirubin >2.5 mg/dL
0
0
0
0
Impaired consciousness/Glasgow Coma Scale <9
4
30.8
1
25.0


## 3.7. Laboratory Parameters Not Included in WHO Criteria among Severe Malaria Cases and Outcome

See Table7.Table 7
Distribution of laboratory parameters not included in WHO criteria among severe malaria cases and outcome.
Sample number
Parameter
Range
Total number
Percentage of total cases
Died
(N=50)
Number
% of cases
1
Total leucocyte count
Leukocytosis (>10000/mm3)
5
10.0%
0
—
Leukopenia (<4000/mm3)
5
10.0%
2
40.0%
Normal(4000–10000/mm3)
40
80.0%
0
—
2
Platelet counts(thousand/mm3)
>150
3
6.0%
0
—
100 to 150
10
20.0%
0
—
50 to 100
24
48.0%
0
—
<50
13
26.0%
2
15.4%
3
Peripheral smear
Positive
49
98.0%
2
4.1%
Negative
1
2.0%
0
—
4
Parasitic index
≤1%
45
90.0%
2
4.5%
>1%
5
10.0%
0
—
5
RMAT
Positive
9
18.0%
0
—
Negative
41
82.0%
2
4.9%
6
SGOT
Raised#
6
12.0%
0
—
Normal
44
88.0%
2
4.6%
7
SGPT
Raised#
4
8.0%
0
—
Normal
46
92.0%
2
4.4%
8
Serum bilirubin
Raised#
1
2.0%
0
—
Normal
49
98.0%
2
4.1%
9
Serum creatinine
Raised(>1.0 mg/dL)
5
10.0%
1
20.0%
<1.0 mg/dL
45
90.0%
1
2.2%
#Based on normal reference range for age and sex.


## 3.8. Outcome

Among the total of 50 cases studied 2 cases died with a case fatality rate of 4%.Among the total of 50 cases studied 10 cases (20%) required ICU admission.


## 4. Discussion

Males were more affected than females, which is possibly due to increased outdoor activity and increased exposure to mosquitoes in males as compared to females. Kochar et al. found similar results in their study with 33.0% females affected among cases ofP. vivax malaria. Age distribution among various age groups was 33.9% in 0–5 years, 30.1% in 5–10 years, and 30% in >10 years, which was almost similar in all age groups [6]. A study done in East Delhi studied population of 1 to 12 years which shows 59.7% males and 40.3% females havingP. vivax malaria, as compared to our study which shows 69% males and 31% females havingP. vivax malaria in similar age group of 1 to 12 years [7].The most common presentation was fever, present in 48 out of total of 50 cases (96%).High fever trends are evident inP. vivax disease even with lower parasitemia due to its recognized lower fever-threshold (around 100 infected RBCs/microliter) [8].It was followed by pallor which was present in 31 cases (62%). Two common causes of anemia are increased hemolysis and decreased rate of erythrocyte production from bone marrow whereas the malnutrition and intestinal parasitic infections aggravate this problem in highly endemic areas. In a study about 50% of patients withP. falciparum and mixed infections were anemic while 29% ofP. vivax infected cases had this abnormality [9].Major confounding factors in the global analysis of anemia are the local contributors to this hematological complication such as iron-deficiency anemia [10].None of the cases presented with renal impairment, hypoglycemia, jaundice, and hyperparasitemia.The new WHO guidelines already point to hyperbilirubinemia (total bilirubin >3.0 mg/dL) as a weak marker of severity, unless it is followed by any other vital organ dysfunction [11].Two cases died; both had pulmonary edema and bleeding and 1 case had impaired consciousness.Major predictor of mortality among these predefined WHO severity criteria was pulmonary edema/ARDS with 100% mortality, whereas patients with severe anemia, circulatory collapse, and repeated generalized convulsions had 100% survival rate.The statistical significance was not applicable as there were only 2 deaths among the study group.Anstey et al. suggested thatP. vivax patients are more likely to suffer from respiratory distress syndrome as they have more severe alveolar capillary dysfunction. Sequestration ofP. vivax infected erythrocytes in the pulmonary microvasculature and greater inflammatory response to a given parasitic burden inP. vivax are probably responsible for this alveolar capillary dysfunction. Small airway obstruction, gas exchange alteration, increased phagocytic activity, and accumulation of pulmonary monocytes are the other suggested mechanisms for respiratory complications [12].Case fatality rate in this study was 4%. Most of the earlier published literature consists of few death reports or small descriptive clinical series lacking denominators. Recent study from Papua, Indonesia, reported 1.6% and 2.2% case fatality rate caused byP. vivax andP. falciparum, respectively [6]. Case fatality rate in the studies above and this study thus stressesP. vivax infection to be almost equally serious in causing significant mortality in comparison toP. falciparum.Among the laboratory parameters as mentioned in Table7 major predictor of mortality emerged as leukopenia with 40% mortality followed by thrombocytopenia (platelet count <50,000/mm3).Among the total of 50 cases studied 10 cases (20%) required ICU admission.In a study done in Manaus a rough estimation of the risk of ICU admission per species showed similar relative risks forP. vivax (4.7/10,000 cases) andP. falciparum (5.5/10,000 cases). The study included all reported cases of malaria in children of 0–14 years of age in Manaus [13].Our study population was not an ideal population representative and that may be the reason for high ICU admission rate in our study. Further study is needed to study the burden ofP. vivax malaria on ICU facility in hospitalized patients so as to estimate the optimum requirement of facilities to maximize the patient care.Limitations of our study were small sample size and existing confounding factors of different parameters, though the study shows the diverse clinical presentations ofP. vivax malaria ranging from fever to cerebral malaria, ARDS, and pulmonary edema and also emphasizes the importance of severity ofP. vivax malaria and there is a need for further studies to establish mortality and severity predictors specific toP. vivax malaria.


## 5. Conclusion

The present study highlights the epidemiology ofP. vivax malaria in pediatric age group. SinceP. vivax was considered a benign disease, there are scarce reports. The study stresses thatPlasmodium vivax can result in severe disease and can no longer be considered a benign condition. The present study shows that some manifestations of WHO severity criteria were not seen in severeP. vivax malaria (renal impairment, hypoglycemia, jaundice, and hyperparasitemia), whereas leukopenia and thrombocytopenia which are not part of WHO severity criteria were frequently present and were associated with mortality. This implicates the need for separate severity parameters forP. vivax malaria. However, larger studies need to be undertaken to establish the specific severity parameters and poor prognostic indicators.



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