Defender (Kennedy's publication) discusses how improved sanitation better than vaccines in improving children health; here is the underpinning research study out of India/BMJ

by Paul Alexander

India: researchers from University of California, Irvine (UCI) modestly propose sanitation improvements “may play a role in strengthening [young] children’s immune response”; vaccines cannot say same

Elegant simple study in India shows it’s improved sanitation and hygiene that improves health, not vaccine as was shoved down our throats! Certainly does not deserve the singular credit it is given, or the key role.

SOURCES here and here