The dense worldwide transportation network constructed by humans is now powering so-called variants (mutations) of COVID-19 across the world from their countries of origin. The British variant (called B.1.1.7), the Brazilian variant (called P.1) and the South African variant (called B.1.351) are all racing across the globe. This shouldn't be surprising since all three are thought to be more contagious than the original virus.
The Brazilian variant is thought to be capable of reinfecting people who have already had the original virus. And, it may have greater capabilities to evade the protections created by vaccines.
That this is happening is no surprise to people who understand viruses, particularly those with knowledge of coronaviruses. Almost exactly one year ago I sat across from a colleague at dinner who knows a lot about coronaviruses. Let me summarize what he told me: