Influenza viruses, illustration. Influenza, also known as the flu, is a highly contagious infectious disease caused by the influenza virus. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / NOBEASTSOFIERCE |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |