The Center for Disease Control and Prevention (CDC) and World Health Organization (WHO) recommend the following vaccines for India travel: hepatitis A, hepatitis B, typhoid, yellow fever, Japanese encephalitis, rabies, meningitis, polio, measles, mumps and rubella (MMR), Tdap (tetanus, diphtheria and pertussis), chickenpox, shingles, pneumonia, and influenza.
Japanese Encephalitis is a severe threat in India. Dengue is also quite common in India during monsoon and summer seasons. Although vaccination is not required, mosquito repellants and netting can help protect against both Japanese encephalitis and dengue. A yellow fever vaccination certificate is required by all travelers coming from an infected country. Meningitis is a periodic risk, so vaccination is advised. Rabies is also present in India. So, those visitors who are at high risk, it is safe if you consider vaccination before coming to India. For more details on vaccination requirement, you may visit the CDC website:
