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Deprecated: Implicit conversion from float 259.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Iran+J+Allergy+Asthma+Immunol 2021 ; 20 (1): 106-113 Nephropedia Template TP
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Relationship between Bacillus Calmette Guerin Vaccination Policy and Coronavirus Disease-2019 (COVID-19) Incidence #MMPMID33639625
Bacillus Calmette Guerin (BCG) was designed for protecting children against tuberculosis. Also, it can protect against other infectious diseases through the induction of trained immunity. Due to its heterologous protective effects, the BCG vaccine has been proposed as atreatment option for coronavirus disease-2019 (COVID-19). Epidemiological studies have found that countries without BCG vaccination policy have experienced higher mortality rates related toCOVID-19 infection than those with BCG vaccination policy. However, there are some confounding factors such as age, population intensity, immigration, the pandemic phase, and data accuracy that may affect these results. Therefore, this hypothesis should be evaluated by clinical trial studies. Large-scale clinical trials are in progress to investigate ifthe BCG vaccine could be used as a useful tool for protection against COVID-19 infection.