The spread of COVID-19 in the Americas driven by the Omicron variant of the virus reached levels of transmission never before seen during the pandemic, with cases doubling to 6.1 million over the past week, the Pan American Health Organization (PAHO) said on January 12.

According to a Wall Street Journal report, the preferred Covid-19 shot globally is the Pfizer-BioNTech vaccine.

A study showed the use of convalescent plasma provided no clinical benefit nor improved mortality in Covid-19 patients with pneumonia.

Using blood plasma from Covid-19 survivors to treat patients with severe pneumonia caused by the novel coronavirus showed little benefit, according to data released from a clinical trial in Argentina.