Prof. Penka Petrova: 60% of Sofia residents have no protection against COVID-19
– – Prof. Penka Petrova, Director of the Institute of Microbiology at the Bulgarian Academy of Sciences – The low level of vaccination against COVID-19 in our country is the reason for the fourth wave of the spread of the infection. So far, 778,000 doses of vaccines have been given in Sofia, which means that … Read more