Preprint: Duration of immune protection of SARS-CoV-2 natural infection against reinfection

“Effectiveness of primary infection against severe, critical, or fatal COVID-19 reinfection was 97.3% (95% CI: 94.9- 98.6%), irrespective of the variant of primary infection or reinfection, and with no evidence for waning.”  More...

North Korea: Omicron BA.2 entered the country on propaganda balloons

“The National Emergency Response Command, as the entry of the malicious virus has been confirmed, is alerting us to weather phenomena, including wind, and unusual objects flying from balloons in the demarcation line and border areas, thoroughly explaining the source, and reporting immediately upon discovery.”  More...