Only 13% of doctors and 21% of nurses vaccinated against influenza.
40% of health care workers believe that flu vaccine can cause flu. (Beijing, China)
Varicella outbreak in a school, where 98.6% of children had been vaccinated (63% of them with two doses).
Of the unvaccinated children, 14% got infected, of those vaccinated with one dose – 1.6%, and of those vaccinated with two doses – 2%.
The authors conclude that higher two-dose vaccination coverage is needed to prevent outbreaks.
The answer to the question, how natural immunity is produced was already given back in the 20s of last century. Tetanus bacteria were found in the intestines of 35% of the 78 men tested in Beijing. Tetanus was a very rare disease in China in early 20th century (not counting the neonatal tetanus).
Researchers found tetanus bacteria in the patients’ stool even after they spent three months in the hospital on a virtually sterile diet. This can lead to a conclusion that tetanus bacteria multiply in the intestines.