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The Omicron variant was detected for the first time in South Africa in November 2021 and has since spread to many countries. It is expected to become

New research by a team of University of Florida investigators, and others, provides evidence that host immunity drives evolution of the dengue virus. The work, published Nov. 18 in Science, retrospectively analyzes two decades of dengue virus genetic

New research by a team of University of Florida investigators, and others, provides evidence that host immunity drives evolution of the dengue virus.

The fast-spreading version of the virus has been found in other countries too, and experts fear it may cause a winter COVID-19 surge if not enough people are vaccinated.

Israel is offering a third dose of a COVID-19 vaccine to people who are immune compromised. Since April, France has encouraged the same for transplant recipients, dialysis patients and those on powerful immune-compromising medication. Vaccine companies are studying the effectiveness of a third shot – either identical to the first two or tailored to a variant. So it becomes logical to ask whether Americans need booster shots to protect against the new variants, including delta, first seen in India. For now, the government has said boosters aren't needed. A third shot hasn't been proven safe...