Dr. Howard Smith Oncall

  Vidcast:  https://youtu.be/EgasQoFohj4   A 4th shot of Pfizer vaccine versus only 3 shots improves your protection against a breakthrough infection by up to 64% and your protection against a severe or deadly infection by about 73%.  Israeli investigators report these results after analyzing the effect of vaccination and boosts in 97,499 persons over the age of 60 from January 10th to March 13th, 2022 while Omicron was in predominance.   Looking at the additional protective effect against a breakthrough infection of the 2nd booster compared with only vaccination and one booster, it peaks during the 3rd week following inoculation at 64% but then declines from the 4th to the 9th week to an additional protective effect of 29%.  The 4th shot protection was better in both degree and longevity against a severe or deadly infection peaking at 86% by 6 weeks after the shot and persisting at or above that level through the 9th week post-inoculation.   The 4th shot is a must for older persons and those with complicatin