It does not include vaccines against other potentially deadly diseases such as HiB vaccine for Haemophilus influenza type b, MMR for measles, mumps and rubella, varicella vaccine for chicken pox, flu vaccine for influenza, pneumococcal vaccine for Strep. pneumoniae, rotavirus vaccine for rotavirus diarrhea, meningococcal vaccine for N. meningitides, hepatitis A, and typhoid. Although most of these diseases are generally self-limiting, complications do occur after natural infection. Mumps may cause viral encephalitis (a form of brain infection) and sterility in males. Rubella also known as german measles results in congenital defects of the unborn baby or even abortion if a pregnant mother gets infected. Rotavirus is the most common cause of diarrhea which may cause death if complications of dehydration arise. Hepatitis A is a significant cause of death and morbidity especially among adults but the vaccine is recommended to be given as early as 1-2 years of age. Pneumococcal and Hib vaccines prevent serious infections like meningitis (brain infection) and pneumonia. Sadly, only the middle to upper income groups are able to afford and, thus, avail of these equally important vaccines.