The detection of additional variants adds to concerns that a brutal COVID-19 wave battering Brazil may keep breaking grim records for weeks to come.
The rapid spread of the P.1 variant in some parts of Canada has added new urgency to the race between variants and vaccines.
The variant first identified in Brazil -- P1 -- is also the variant in a cluster in Whistler, B.C., that prompted health authorities to shut down the ski resort on Monday.
Brazil's outbreak has set weekly records due to a patchy vaccine rollout, a lack of national coordination and an infectious new variant.
In previously published studies, Pfizer had found that its vaccine neutralized other more contagious variants first identified in the United Kingdom and South Africa.
The data indicates that the vaccine will not need to be modified in order to protect against the variant.
Public Health England said it is "taking swift and decisive action to deploy surge asymptomatic testing as well as increasing sequencing of positive samples from the area."
Scientists still think reinfections are fairly rare and usually less serious than initial ones, but recent developments around the world have raised concerns.
As variants of the novel coronavirus continue to emerge in Canada, labs are looking for mutations in just five per cent of COVID-positive cases.
The ban, which took effect Friday morning, was extended to Portugal because many people who come to Europe from South America travel through Portugal.