the disease is moderately to highly transmissible; in addition to direct and indirect transmission, there may also be possibilities of airborne, waterborne or vector–borne spread.
is galar a tharchuirtear éasca go leor nó go han-éasca é; de bhreis ar tharchur díreach agus indíreach, d'fhéadfaí freisin go scaipfí san aer, san uisce nó trí veicteoirí é.