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A study by the University of Texas Medical Branch, in partnership with Kaiser Health News, reveals that Pfizer's COVID-19 vaccine is effective against a virus mutation. The study involved blood samples from 20 clinical trial participants. While results are promising, more data is needed. Meanwhile, Moderna's CEO claims their vaccine may offer protection for years, as antibodies decay slowly. Moderna is also close to proving its vaccine's effectiveness against new strains from the UK and South Africa. The Moderna vaccine has been authorized for use in the UK.

What did the study in partnership with Kaiser Health News reveal about Pfizer's vaccine?

• It can neutralize a version of the virus with a changed outer structure.

• It is ineffective against virus mutations.

• It causes severe side effects.

• It is only effective for a few months.

How many people were involved in the study testing Pfizer's vaccine?

• 20 people

• 50 people

• 100 people

• 10 people

What does Moderna claim about the longevity of its vaccine's protection?

• It requires monthly boosters.

• It is ineffective against new strains.

• It may offer protection for years.

• It offers protection for a few months.

What is Moderna close to proving about its vaccine?

• It causes severe side effects.

• It is ineffective against the original virus.

• It is effective against new strains seen in the UK and South Africa.

• It is only effective for a few months.

Where has Moderna's COVID vaccine been authorized for use?

• In Canada

• In the UK

• In Australia

• In the USA