Most people think that vaccines are only for babies and toddlers but there are a few essential vaccines even adults should get. Here is everything you need to know about adult vaccines. Are adult vaccines really necessary? According to Padmashree Dr V S Natarajan Geriatric Physician Government General Hospital Chennai 'Yes. Adult vaccination is necessary because as one grows older their immunity reduces due to the natural ageing process. Apart from that diseases like diabetes liver failure heart failure kidney failure asthma cancer and other factors like steroids immune-suppressants and poor nutrition render a person weak and susceptible to diseases.'