chrípka 2 [vynechat] epidemics 2 [vynechat] epidémie 2 [vynechat] influenza COVID-19 1 [vynechat] Covid-19 (disease) 1 [vynechat] coronaviruses 1 [vynechat] dejiny medicíny 1 [vynechat] history of medicine 1 [vynechat] infectious diseases 1 [vynechat] infekčné choroby 1 [vynechat] influenza viruses 1 [vynechat] koronavírusy 1 [vynechat] pandemy 1 [vynechat] pandémie 1 [vynechat] vírusy chrípky 1 [vynechat]