Measles is associated with a reduced risk of chronic lymphocytic leukemia by 47%. The more childhood diseases (mumps, chickenpox, whooping cough, etc.), the lower the risk of lymphocytic leukemia. One-two children's illnesses reduced it by 16%, and three and more diseases - by 53%.Childhood leukemia and infectious diseases in the first year of life: a register-based case-control study. 1986, van Steensel-Moll, Am J Epidemiol
Colds, temperature and childhood infections are associated with a decrease in the risk of leukemia.
Even more similar studies:
Children who had whooping cough during childhood, had a 1.5-2 times lower risk of developing some types of leukemia.