With most people in China having been infected with COVID-19, herd immunity has been reached and the transmission ability of the epidemic gradually weakens, said Fang Bangjiang, a doctor from Longhua Hospital Affiliated with Shanghai University of Traditional Chinese Medicine, on Friday. Data relea...
Ever since COVID-19 hit, I’ve been repeating the mantra, “Everything old is new again”. The reason is simple. Key to understanding a lot of the misinformation about COVID-19, its spread, and COVID-19 vaccines is an understanding that none of this misinformation is ne...
Both of the two individuals classified as probable reinfections reported having experienced COVID-19 symptoms during the first wave of the pandemic but were not tested at the time. Both reported that their symptoms were less severe the second time. None of the 44 potential reinfection cases were...
People with the "hybrid immunity" of having been both fully vaccinated and previously infected with COVID-19 have the strongest protection against the virus, two new studies said on Friday. After two years of a pandemic that has seen nearly 500 million people infected and billions vaccinated, t...
When COVID-19 first began spreading, public health and medical experts began talking about the need for the U.S. to reach herd immunity to stop the coronavirus from spreading. Experts have estimated that between 60% and 90% of people in the U.S. would need to be vaccinated for that to...
We evaluate the connection between corporate characteristics and the reaction of stock returns to COVID-19 cases using data on more than 6,700 firms across 61 economies. The pandemic-induced drop in stock returns was milder among firms with stronger pre-2020 finances (more cash and undrawn credi...
Nationally, as of July 12, CDC said it was aware of more than 4,400 people who got Covid-19 after being fully vaccinated and had to be hospitalized; and 1,063 fully vaccinated people who died of Covid. But health officials still argue that vaccinated people make up only...
The extent of the health, societal and economic consequences that have arisen due to the presence of SARS-CoV-2 and the severity of COVID-19 have focussed attention on the devastation infectious illness can cause and on the importance of having well- functioning immune systems. Inadequate...
COVID-19COVID-19 vaccinesASTRAZENECA PLCBackground: The aim of the study was to evaluate the humoral and cellular immunity after SARS-CoV-2 infection and/or vaccination according to the type of vaccine, number of doses and combination of vaccines. Methods: Volunteer ...
While some lucky people claim to have never had COVID, many are facing our second, third or even fourth infection, often despite having been vaccinated. You might be wondering, how long does immunity last after a previous infection or vaccination?