Highlighting the studies on prophylaxis of SARS-CoV-2 infection, the advisory stated that a retrospective case-control analysis at ICMR has found that there is a significant dose-response relationship between the number of prophylactic doses taken and frequency of occurrence of SARSCoV-2 infection in symptomatic healthcare workers who were tested for coronavirus infection.
Another investigation from three central government hospitals in New Delhi indicates that amongst healthcare workers involved in Covid-19 care, those on HCQ prophylaxis were less likely to develop SARS-CoV-2 infection, compared to those who were not on it.
The benefit was less pronounced in healthcare workers caring for a general patient population.
Besides, an observational prospective study of 334 healthcare workers at AIIMS, out of which 248 took HCQ prophylaxis in New Delhi also showed that those taking HCQ prophylaxis had lower incidence of SARS-CoV-2 infection than those not taking it.