Have you read this IOM adverse effects of Vaccines Evidence and Causality
looks at all the research available and also whether there is a mechanism for the vaccines to cause particular side effects. Also good information on the actually disease
ie Mumps
"The average incubation period of the mumps virus is 16 to 18 days but can range from 2 to 4 weeks (Litman and Baum, 2010). Fifteen to 20 percent of mumps infections are asymptomatic; 50 percent of cases have nonspecific symptoms such as anorexia, headache, fever, and malaise, or present primarily as respiratory infections; and only 30 to 40 percent demonstrate the classic salivary gland tenderness and enlargement (parotitis) (CDC, 1998). Asymptomatic infection is more common in adults, while parotitis occurs most often in children age 2 to 9 years (CDC, 1998). Children younger than 5 years old more commonly manifest symptoms of lower respiratory disease (Plotkin and Rubin, 2008). Complications of mumps infection are possible without the presence of parotitis. In 1958, Philip et al. (1959) observed testicular and mammary inflammation in 5 percent of postpubertal men and 31 percent of women over 15 years of age. Pancreatitis occurs in 4 percent of cases, and although it has not been proven, evidence suggests an association between mumps infection and diabetes mellitus (Sultz et al., 1975). Neurological complications are more common in adults and occur three times more often in men than in women (Plotkin and Rubin, 2008). These complications include mumps meningitis, cerebellar ataxia, transverse myelitis and poliomyelitis-like disease, cranial nerve palsies, hydroencephalitis, and encephalitis, which occurs in less than 0.3 percent of cases, but is responsible for more than 50 percent of mumps-related fatalities "