Please select the eligibility criteria that correspond to the clinical trial below.
Title: Antibiotics in Patients With Acute Respiratory Tract Infections in Primary Care in Consideration of Procalcitonin as Additive Parameter
Brief Summary: Antibiotics in patients with acute respiratory tract infections in primary care in consideration of procalcitonin as additive parameter.

The purpose of this study is to compare the ordinary manner of antibiotic- prescription with the prescription in consideration of procalcitonin-value in patients with acute respiratory tract infections.


Options:
A: Inclusion Criteria:

* Patient hospitalised in the ICU
* Bacterial infection suspected
* At ICU admission the patient do not receive antibiotics or receive antibiotics for less than 24hours and an interval between admission and inclusion \< 12 hours
* During ICU stay, provided that the interval between the start of suspected infection and inclusion is \< 12hours
* Written inform consent from the patient or relatives. The consent may be obtained after the enrollment if the patient is not able to give consent and if there is no relatives

Exclusion Criteria:

* Age \< 18 years
* Pregnancy
* Patient expected to remain hospitalised in the ICU for less than 3 days
* Neutropenia
* Infection or presumed infection requiring prolonged antibiotic therapy (endocarditis,osteo-articular infection, mediastinitis, deep abscess, tuberculosis, pneumocystis pneumonia, toxoplasmosis).
* Simplified Acute Physiology Score II at ICU admission (calculated during the first 12h)
* Attending physician declining to use full life support.
B: Inclusion Criteria:

* suspected lower respiratory tract infection
* must be able to give consent

Exclusion Criteria:

* age under 18 years
* not able to give consent
* admitted not primarily because of the respiratory tract infection
* hospital acquired infections
C: Inclusion Criteria:

* 18 years or older
* Informed consent
* Respiratory tract infection based on the clinical judgement of the primary care physician

Exclusion Criteria:

* Antibiotic pretreatment in previous 14 days
* Portal hypertension
* Major surgeries or multiple trauma which require hospitalization, in previous 4 weeks
* Autoimmune disease and systemic diseases (lupus erythematodes, wegener´s disease)
* Peritoneal dialysis
* Acute treated or recently operated medullary c-cell-carcinoma, SCLC, carcinoid
* Other inflammatory diseases (e.g. urinary tract infection, pyelonephritis, pancreatitis
D: Inclusion Criteria:

* age \> 17 years
* patients in intensive care unit
* signed informed consent
* suspected or confirmed severe sepsis or septic shock

Exclusion Criteria:

* Infections caused by Listeria spp, Legionella pneumophilia, Mycobacterium tuberculosis
* Bacteremia due S. aureus
* Infections requiring prolonged therapies, such as endocarditis, cerebral abscess, chronic osteomyelitis
* Suspected or confirmed infection caused by virus, parasites
* Infections caused by P. aeruginosa ou A. baumannii
* Severe immunosuppression (ex: AIDS, post bone-marrow transplant,cystic fibrosis)
* Traumatism latest five days
* Surgery latest 5 days
* Carcinoid tumor, lung cancer, medullary thyroid cancer

Answer: C