美国家医学会的指导
https://www.aafp.org/news/health-of-the-public/novavax-booster-authorization.html
…………
give individuals 18 years and older the option to receive a Novavax monovalent booster instead of the bivalent Pfizer-BioNTech or Moderna booster if they have completed a primary vaccination series but have not previously received a COVID-19 booster, and if they do not want to receive (or are allergic to a component in) mRNA vaccines.
………
CDC官方指南，更为严格。
https://www.cdc.gov/vaccines/covid-19/info-by-product/novavax/downloads/novavax-standing-orders.pdf
搞重点如下：
If the recipient has never received a COVID-19 vaccine, administer 1 dose of Novavax COVID-19 Vaccine.
（没打过任何疫苗，才能打第一针Novavax)
If the recipient has received 1 previous dose of:
○ Novavax COVID-19 Vaccine, administer the second dose at
least 3-8 weeks‡ after Dose 1. (Primary series completed)
(而后才能打第二针，算做完全接种）
If the recipient has received 2 previous doses of monovalent Novavax COVID-19 Vaccine, administer a bivalent booster dose. （打了两针Novavax之后，要打双价加强针）
If the recipient has received a completed primary series of COVID-19 vaccine (Moderna, Pfizer-BioNTech, Novavax or Janssen), administer a single Novavax booster dose at least 6 months after the last primary series dose to persons 18 years of age and older who have not received a previous booster dose(s) in limited situations.
（这段比较狠，要反复细读、认真领会。俺的理解：在完全接种至少六个月后，没有打过其它加强针的，才有资格打Novavax做为加强针）
这疫苗，就是小妾养的受气包。
