Merck says hepatitis vaccine may be faulty
Merck & Co. said that an unknown number of people in up to 27 nations, including 60000 youngsters in Brazil, may need new shots to prevent infection with the hepatitis A virus because the vaccines
Merck & Co. said that an unknown number of people in up to 27 nations, including 60000 youngsters in Brazil, may need new shots to prevent infection with the hepatitis A virus because the vaccines