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Corona Virus Infection Chain














                                                        Infection Agent

                                                             Viruses



                 Host susceptible

                  Immunity of host                                                             Reservoirs
                        Age                                                                 Human reservoirs

                       Surgery                                                              Animal reservoirs
                  Chronic diseases
















                                                                                             Portals of Exit
                 Portals of entry
                                                                                             With respiratory
                    Through the                                                               Droplets from
                 respiratory system                                                             coughing,

                   Mouth and eyes                                                          sneezing, speaking
                                                                                              and exhaling

                                                           Mode of
                                                        transmission

                                                        Direct contacts
                                                      Respiratory droplet
                                                            spread
                                                         Direct contact











                                                                 Tg_2018_437
                                                                 B.M.H.S.Batugedara
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