Ndokusaka World Health Organization (vakabatsirwa National Influenza Centers) anoita kurumbidza maviri akasiyana mishonga yokudzivirira zvirwere ose gore; mumwe Northern, uye mumwe Southern Hemisphere. A refu-refu dambanemazwi rave nei kubuda kwechirwere chirwere kunoitika mwaka pane zvakafanana mugore rose. Imwe tsananguro ingangova yokuti, nokuti vanhu vari indoors kakawanda munguva yechando, vari pedyo kuonana kakawanda, uye izvi zvinosimudzira hutachiwana kubva munhu nomunhu. Kuwedzera kufamba nokuda Northern Hemisphere yechando yezororo mwaka kunogonawo kutamba basa. Chimwe chinhu kuti kutungamirira kutonhora mhepo tembiricha, izvo zvinogona kuderedza mucus mucus. Dry particles dzakareruka D. ° uye mumwe nokuda Southern Hemisphere.
aerosol kuparadzirwa