[Effect of previous exposure to COVID-19, occurrence of spikes, and type of vaccine on the humoral immune response of institutionalized older adults].

This study evaluated the explanatory factors of humoral immune response in older adults admitted to long-term care institutions in Buenos Aires, Argentina, up to 180 days after vaccination. An open-label, prospective, multicenter cohort study was conducted with volunteers who received two doses of the Sputnik V, Sinopharm, or AZD1222 vaccines. Plasma samples were analyzed at 0 and 21 days after the first dose, 21 days after the second dose, and 120 and 180 days after the first dose.

Male cytogenetic evaluation prior to assisted reproduction procedures performed in Mar del Plata, Argentina.

Objective: This paper aimed to estimate the frequency of occurrence and the types of chromosomal abnormalities found in 141 infertile men with abnormal semen parameters.

Methods: the frequency and type of chromosomal abnormalities were determined with male mitotic karyotype analysis from peripheral blood through chromosome banding techniques before assisted reproduction procedures.

Results: In this series of 141 infertile men, 19 (13%) had chromosomal anomalies and 35 (25%) had polymorphic variants.