Johnson & Johnson said its single-dose vaccine protects against breakthrough COVID-19 for up to six months.
Citing a study that it sponsored, Johnson & Johnson said in a release Thursday that protection against infection from its single-dose vaccine starts to wane only from the fourth month compared to the second month in the case of two-dose vaccines from rivals Pfizer and Moderna, which use mRNA technology whereas the J&J shot uses an adenovirus.
