This week there is a further downgrading of CDC alert levels in many locations, especially in Africa, but also in Philippines, Mexico, UAE and some others.
(The alert levels were raised to the highest levels for Hong Kong, Thailand, and New Zealand because of high and rising case numbers.)
This commentary on travel measures from the London School of Hygiene and Tropical Medicine is interesting, and well worth reading – Kucharski et al:
A very large nationwide French study looking at effectiveness of the Janssen vaccine compared with the Pfizer, was published by Botton et al: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2789572
“This study found that the Ad26.COV2.S [Janssen] vaccine is less effective against COVID-19–related hospitalization than the BNT162b2 [Pfizer] vaccine. These results strengthen the evidence supporting a second dose in people who received the [Janssen] vaccine by an mRNA vaccine as recommended in both France and the US.”