Blood donations are down — so why restrict blood donors by sexual orientation?

The blood supply in the US is critically low. Donations dropped off so dramatically during the COVID-19 pandemic that the American Red Cross has declared a national blood crisis. And since donated red blood cells only last about six weeks, supplies cannot be stockpiled in advance. A severe shortage could require difficult decisions about who …

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A common virus may be one contributing cause of multiple sclerosis

Discovering the cause of a disease is not easy. One reason is that the vast majority of diseases do not have a single cause. Instead, most diseases occur because multiple factors combine to cause the disease. One factor is genes. Some people are born with one or more genes that make them vulnerable to a …

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