A very disturbing paper published in The Lancet Infectious Diseases proposes that vaccines can have unexpected side effects. Some are good, such as protecting against unrelated diseases, while some are bad, such as increasing all-cause mortality. This is highly useful and potentially life-saving information that must not be hijacked by anti-vaxxers.
A new study purports to link levels of chemical exposures to reduced response levels to bacille Calmette-Guerin vaccine in infants. The authors fail to note that simply measuring two chemicals and finding some impairment in some function does not mean that the chemicals caused it.