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Science’s COVID-19 reporting is supported by the Heising-Simons Foundation. A few months ago, transplant surgeon Dorry Segev was despondent about how COVID-19 vaccines were performing in patients like his, who have a donated organ and take powerful drugs to suppress their immune system. After one dose of a highly effective messenger RNA (mRNA) vaccine, for example, just 17% of those patients churned out protective antibodies against the pandemic coronavirus, and after the standard two doses, only 54% did. The very medications his patients took to protect their transplanted organ precluded t...

  TORONTO -- Experts say COVID-19 vaccines may promote little or no response in people taking certain medications or those with underlying conditions, and are calling for more research to protect this group. Dr. Deepali Kumar, the head of the University Health Network's Transplant Infectious Diseases Clinic in Toronto, told CTVNews.ca that researchers don't yet know how effective COVID-19 vaccines are in immunocompromised patients. "We know that in immunosuppressed people, antibody responses are generally lower for COVID vaccines than in the general population… but we don't know how...

People with immune issues – at 'high risk' for COVID-19 – remain hesitant about vaccination. Here's what experts say Karen Weintraub, USA TODAY UP NEXT Joanne Troutman always knew she was going to get vaccinated against COVID-19. She's a strong supporter of vaccines and runs a United Way in rural Pennsylvania that offers services to people who are in need.   But she admitted some apprehension about what would happen after the needle plunged into her shoulder. Troutman has struggled with autoimmune disease for years. Would the immune trigger send her disease into over...

In what is believed to be the first Canadian study of its kind, researchers have discovered what they describe as a 'significant number of asymptomatic infections' of the novel coronavirus among health-care workers

In what is believed to be the first Canadian study of its kind, researchers have discovered what they describe as a 'significant number of asymptomatic infections' of the novel coronavirus among health-care workers