11. People can acquire natural immunity to malaria, so making an antimalaria vaccine should be possible. 12. Infection induces incomplete natural immunity that wanes over time. 13. :: : : It's not just lack of vaccines, it is lack of natural immunity . 14. Doctors once assumed that patients'natural immunity would keep them from getting the virus more than once. 15. In 1738 and 1739 smallpox epidemics broke out among the Cherokee, who had no natural immunity . 16. That is comparable to natural immunity to rotaviruses, and also to the efficacy of influenza vaccines. 17. Thousands more of the Indians succumbed to European diseases to which they had no natural immunity . 18. Most successful human vaccines have been developed on the basis of understanding natural immunity , he said. 19. Solid natural immunity develops in recovered birds. 20. California's native population precipitously declined, above all, from Eurasian diseases to which they had no natural immunity .
