Strength and durability of indirect protection against SARS-CoV-2 infection through vaccine and infection-acquired immunity by Sophia T. Tan, Isabel Rodríguez-Barraquer, Ada T. Kwan, Seth Blumberg, Hailey J. Park, Justine Hutchinson, David Leidner, Joseph A. Lewnard, David Sears, Nathan C. Lo

“…Analyzing anonymized SARS-CoV-2 surveillance data from 9,625 residents in California state prisons from December 2021 to December 2022, we find that vaccine-derived indirect protection against Omicron SARS-CoV-2 infection is strongest within three months of COVID-19 vaccination [30% (95% confidence interval: 20–38%)] with subsequent modest protection. …”
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Antibody to Hepatitis C Virus in Risk Groups in Canada by RK Chaudhary, Theresa Mo

“…Repeat positive samples were further tested by recombinant immunoblot assay (RIBA) HCV (Chiron Corp, California). The number of samples positive for antibodies to HCV (anti-HCV) was higher with enzyme immunoassay than by RIBA HCV in most cases. …”
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