<qa>  What is the name of the PCR for Clostridium difficile?Stool testing Clostridium difficile by polymerase chain reaction PCR PCR for Shigella, Salmonella, E.coli verotoxin, Campylobacter Cryptosporidium Ova and parasites Serological testing HIV, type 1 and 2 Hepatitis A IgM Hepatitis B surface antigen, hepatitis B core antibody and hepatitis B surface antibody. 