efficacy of convalescent plasma therapy in severely sick covid-19 patients

Conditions: COVID

Summary: currently, no effective treatments are available for the covid-19 pandemic, which is related to more than 70,000 deaths all over the world. scientists and researchers are working on many aspects of treatment options for the development of vaccination and medication to combat this life-threatening problem. convalescent plasma from recovered covid-19 patients contains antibodies against covid-19 which may be beneficial to severely sick covid019 infected patients. we have planned a randomized controlled trial to assess the efficacy of this therapy in covid-19 infected sick patients. we will collect up to 500 ml convalescent plasma from the covid-19 infected recovered patient after 14 days of clinical and radiological recovery with two consecutive covid-19 negative tests by pcr. we will further test the sample from the collected plasma for covid-19 specific antibodies and their titer. this plasma will be frozen and sent to the treating center (mamc). 200-600 ml of convalescent plasma will be transfused to patients who fit the eligibility criteria and are randomized to the convalescent plasma group. this will be done in severely sick patients. data will be collected for the benefit and adverse events related to convalescent plasma transfusion.

for donors: microtiter plates will be coated overnight at 4°c with 4 μg/ml recombinant sars-cov-2 rbd (receptor binding domain) proteins (50 μl per well). the plates will be washed 3 times with phosphate-buffered saline (pbs) containing 0.1% vol/vol tween-20(pbst) and blocked with blocking solution (pbs containing 2% wt/vol nonfat dry milk) for 2 hours at 37 °c. the plates will be then washed with pbst. the serum samples will be diluted to 200-fold into pbs as initial concentration, and serial 3-fold dilutions of serum will be added to the wells and incubated at 37 °c for 60 minutes. after 3 washes, 100 μl of horseradish peroxidase-conjugated goat anti-human igg (for igg antibody titer detection)and igm (for igm antibody titer detection) antibodies solution will be added to each plate, respectively, and incubated at 37 °c for 60 minutes. after 5 washes, 100 μl of tetramethylbenzidine substrate will be added at room temperature in the dark. after 15 minutes, the reaction will be stopped with a2mh2so4 solution (sulfuric acid). the absorbance will be measured at 450nm. all samples will be run in triplicate. the igg titers will be determined by endpoint dilution. serum neutralization assay vero cells (104) will be seeded 24 hours before the infection in a 96-well plate. on the day of infection, the cells will be washed twice. serum samples from patients will be incubated at 56 °c for 30 minutes and then diluted 2-fold in cell culture medium (modified eagle medium). aliquots (40 μl) of diluted serum samples (from2-fold to 2056-fold) will be added to 50 μl of cell culture medium containing 50 times the tissue culture infective dose (tcid50) of the virus strain on a 96-well plate and incubated at 37 °c for 2 hours in co2 5% vol/vol. virus antibody mix will be added to cells in 96-well plates and plates will be incubated at 37 °c with a microscopic examination for cytopathic effect after 5-day incubation. the highest dilution of serum that showed inhibition activity of sars-cov-2 will be recorded as the neutralizing antibody titer. assays will be performed in triplicate with negative control samples from healthy volunteers. for recipients: the serum of each recipient will be obtained and enzyme-linked immunosorbent assay (elisa) and neutralizing antibody titers will be tested one day prior to the convalescent plasma transfusion. changes of receptor binding domain-specific igg titre and neutralizing antibody titers before and after convalescent plasma transfusion in patients will be obtained on day 0, day 1, day 3 and day 7. if possible. all included patients would be randomized to receive either standard medical therapy (supportive therapy) with random donor plasma versus convalescent plasma and standard medical therapy clinical information of all enrolled patients including symptoms at presentation, time to presentation to the hospital and development of pulmonary symptoms would be recorded. the details of comorbid diseases as measured by the charlson index of comorbidity and acute physiology and chronic health evaluation ii (apache ii). details of cross-sectional imaging, chest-x-ray, bacterial or fungal co-infections and details of antibiotic treatment would be recorded. development of complications including acute kidney injury, acute coronary syndrome, myocarditis, acute respiratory distress syndrome, and nosocomial infection will be recorded. the use of high-flow oxygen, non-invasive and invasive ventilation will follow standard guidelines and will be recorded. the details of antiviral treatment including oral oseltamivir, hydroxychloroquine, and use of intravenous steroids will be recorded for all enrolled patients.

Eligibility criteria:
inclusion criteria: - recipient: severe covid -19 infections defined as who interim guidance and the guideline of diagnosis and treatment of covid-19 of national health commission of china (version 5.0) with confirmation by real-time rt-pcr assay with severe disease i.e. meeting any 2 of the following criteria- 1. respiratory distress, rr ≥30 beats/min 2. oxygen saturation level less than 93% in resting state 3. partial pressure of oxygen (pao2)/oxygen concentration (fio2) ≤ 300 mmhg. 4. lung infiltrates \> 50% within 24 to 48 hours 5. very sick (on ventilator) and patients with co-morbidities such as patients with known co-morbid diseases (copd, cad, cld, ckd, cardiopulmonary disease-structural or valvular heart disease) 6. patient presenting with multi organ failure or requiring mechanical ventilation. donor: * known case of recovered covid-19 infection, and * complete resolution of symptoms at least 28 days prior to donation or complete resolution of symptoms at least 14 days prior to donation and negative results for covid-19 either from one or more nasopharyngeal swab specimens or by a molecular diagnostic test from the blood, and negative rt-pcr for covid-19 on two sequential paired nasopharyngeal and throat specimens \> 24 hrs apart (who-cdc guideline). * donor plasma after 2 negative tests and 2 weeks of remaining asymptomatic, without antibody titre \& presence of igg/igm antibodies to covid-19 by serological as per manufacturers instructions. donors negative for these will be deferred). * fulfill all criteria of donor eligibility for donor plasmapheresis under the drugs \& cosmetics act and rules 1945, amended 11.03.2020. exclusion criteria: - recipient * patients with age less than 18 years. * pregnancy * individual with hiv and hepatitis * morbid obesity bmi\>35 kg/m2 * extremely moribund patients with an expected life expectancy of less than 24 hours. * failure to give informed consent from the patient or family members. * hemodynamic instability requiring vasopressors. * previous allergic history to plasma. donor: * donors age \< 18 \& ≥60 years old * do not fulfil all criteria of donor eligibility for donor plasmapheresis under the drugs \& cosmetics act and rules 1945, amended 11.03.2020. * females who have been pregnant and previously transfused donors (to prevent trali). * donors who have taken steroids during treatment for covid-19.

Keywords: convalescent plasma,covid,sars-cov -2