Quote:
Originally Posted by coffeebean
My concern......... is the efficacy of the vaccine as good if the 2nd shot is later than it is supposed to be given which is 28 days for the Moderna vaccine? What if it is days or even weeks late? What happens then? Do we start over?
I'm not expecting anyone to have the answers. Just venting.
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According to the American Society of Health System Pharmacists there is. 54.2% efficacy between the first and second Pfizer vaccine, 95% seven days after the second. As for the.Moderna, 92.1% between dose one and two starting less than 14 days after the first dose. Protection beyond 28 days of a single dose is unknown. Astra Zeneca has yet to be approved but a half dose, which has been discussed, followed by full dose has a 90% efficacy. J & J, when approved, needs only one vaccine and is said to be 98-100% effective depending on age of recipient. This info was updated on 1/8/2021. Has there been studies if the second doses of the first 3 are delayed? Who knows? From what I have read, a four day delay has still given effective immunity. Beyond that?? It would be a shame and a waste to hold back on the second dose and then find that the first dose was a waste. And there lies the problem. I understand that the need is great.