Virologists are alerting doctors to a possibility that could help explain two of the most puzzling aspects of COVID-19—why the severity of the disease varies so widely, and how the infection can be so deadly. In severe cases the virus may enter the brain through the olfactory nerve in the nasal cavity and damage neurons that control…

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According to a study by Janus and Janus,14 percent of male and 11 percent of females in the United States have had personal experience with sadomasochistic sexual practices. Although human behavior is complex, an intriguing link has been identified between sex and violence and a common parasite, Toxoplasma gondii, which is acquired from cats. It is well-established that parasitic infections…

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