Wait, you'd think that the four human coronaviruses that supposedly confer partial immunity against COVID-19 are endemic all over the world. If that's the case, why is Brazil doing so badly?
It is unclear whether this antibody reactivity may confer clinical benefits, for instance, modulating the severity of a SARS-CoV-2 infection.
I think quantifying any protective effect is gonna be pretty difficult.
The trouble is that the article has a clickbait title: "A majority of uninfected adults show pre-existing antibody reactivity against SARS-CoV-2". Which may get translated into "We already have herd immunity" by some television pundit shortly.
And the poorer/denser the country, even more congregation in the fewer climate controlled spaces there are.
I'm Brazilian born and raised, and even though have been out for about 7 years most of my friends and family are still there.
The fact that pretty much everybody I know over there knows at least a handful of people who have died of COVID-19 and hell knows how many that have had it is not "how the media reports it".
The struggle is real, the situation is pretty dire over there.
What data is there that indicates this is the case?