Can a vaccine cocktail offer stronger immunity? Plus, the Pfizer vaccine protects for at least six months.

A new study finds the Pfizer vaccine is very effective six months after the second dose.

A parents group sues a huge school district over reopening schools, claiming the teachers' union is dictating the terms.

The COVID surge in Brazil is threatening to collapse the country's health care system. What role are politics playing in all this?

Could mixing different types of vaccines offer better immunity?

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