Rotavirus, norovirus, adenovirus, and astrovirus are known to cause viral gastroenteritis. Some live vaccinations include&colon; MMR, varicella, certain types of the influenza vaccine, and rotavirus. The vaccine contains a G1P[8] human rotavirus strain. For example, influenza virus has only eight genes and rotavirus has eleven. The rotavirus vaccine is recommended as a prevention for children. Examples of viruses carried by pigs include porcine herpesvirus, rotavirus, parvovirus, and circovirus. Following rotavirus vaccine introduction in the United States, hospitalisation rates have fallen significantly. The vaccines are made from weakened rotavirus. Breastfeeding for at least six months and vaccination against rotavirus is also recommended. The study compared nitazoxanide and probiotics in the treatment of acute rotavirus diarrhea. The experience provoked intense debate about the relative risks and benefits of a rotavirus vaccine. Within "rotavirus A" there are different strains, called serotypes. Two commercial rotavirus vaccines exist and several more are in development. Since 2006, RotaTeq has been one of two vaccines currently used against rotavirus. This protein is used in laboratory tests for rotavirus A infections.