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Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) exhibits variable immunity responses among hosts based on symptom severity. Whether immunity in recovered individuals is effective for avoiding reinfection is poorly understood. Determination of immune memory status against SARS-CoV-2 helps identify reinfection risk and vaccine efficacy. Hence, after recovery from COVID-19, evaluation of protective effectiveness and durable immunity of prior disease could be significant. Recent reports described the dynamics of SARS-CoV-2 -specific humoral and cellular responses for more than six mon...

Aging, heavy metals, and microplastics were among the topics discussed by Bernardo Lemos, Ph.D., during his Keystone Science Lecture.

Theonomist writes: Leaded gasoline is still widely used in so-called "third world" countries, with no apparent ill-effects yet reported. Vague...