SARS-CoV-2 viral load and detection of infectious virus in the respiratory tract are the two
key parameters for estimating infectiousness. As shedding of infectious virus is required for …

Although many studies of long COVID-19 were reported, there was a lack of systematic
research which assessed the differences of long COVID-19 in regard to what unique SARS …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerged late in 2019 and
caused the coronavirus disease 2019 (COVID-19) pandemic that has so far claimed …

Wastewater-based surveillance (WBS) has undergone dramatic advancement in the context
of the coronavirus disease 2019 (COVID-19) pandemic. The power and potential of this …

In late 2022, China transitioned from a strict 'zero-COVID'policy to rapidly abandoning nearly
all interventions and data reporting. This raised great concern about the presumably-rapid …

For the first time in the history of medicine, it has been possible to describe—after a spillover—
the evolution of a new human virus spreading in a non-immune population. This allowed not …

Coronaviruses are important human and animal pathogens. At the end of 2019, a novel
coronavirus was identified as the cause of a cluster of pneumonia cases in Wuhan, a city in …

Background The serial interval is the period of time between symptom onset in the primary
case and symptom onset in the secondary case. Understanding the serial interval is …

Background After the first COVID-19 wave caused by the ancestral lineage, the pandemic
has been fueled from the continuous emergence of new SARS-CoV-2 variants …

The relation between meteorological factors and COVID-19 spread remains uncertain,
particularly with regard to the role of temperature, relative humidity and solar ultraviolet (UV) …