covid-19 vaccination

Why do many health workers who have been vaccinated against Covid-19 still get sick?
Associate Professor, Dr. Tran Dac Phu answers questions about the effectiveness of the Covid-19 vaccine after many staff members of the Ho Chi Minh City Hospital for Tropical
Surprised by the condition of the person who injected 217 doses of Covid-19 vaccine into his body
A man in Germany has received more than 200 doses of the COVID-19 vaccine, but scientists have not detected any abnormalities in his immune system.
Prolonged fever after vaccination may be a symptom of SARS-CoV infection
Prolonged fever after Covid-19 vaccination may not be a side effect of vaccination but a symptom of SARS-CoV-2 infection.