Objectives The recent discoveries of phylogenetically confirmed COVID-19 reinfection cases
worldwide, together with studies suggesting that antibody titres decrease over time, raise the …

Background COVID-19 seroprevalence data, particularly in less developed countries with a
relatively low incidence, has been scant. We aimed to explore the seroprevalence of …

A population-representative serological study was conducted in all districts of the state of
Tamil Nadu (population 72 million), India, in October-November 2020. State-level …

After a year of evolution of the SARS-CoV-2 epidemic, there is still no specific effective
treatment for the disease. Although the majority of infected people experience mild disease …

Background and Objectives Information about humoral and cellular responses to severe
acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and antibody persistence in …

Summary Objectives Latent Tuberculosis infection (LTBI) is postulated to modulate immune
responses and alter disease severity in SARS-CoV-2 co-infection. However, no data exist on …

Background SARS-CoV-2 cases in Germany increased in early March 2020. By April 2020,
cases among health care workers (HCW) were detected across departments at a tertiary …

The recent COVID-19 pandemic poses a serious threat to global public health, thus there is
an urgent need to define the molecular mechanisms involved in SARS-CoV-2 spike (S) …

Erroneous immune responses in COVID-19 could have detrimental effects, which makes
investigation of immune network underlying COVID-19 pathogenesis a requisite. This study …

Patients lacking humoral response have been suggested to develop a less severe COVID-
19, but there are some reports with a prolonged, relapsing or deadly course. From April …