The D|AX various B|EH|R|I|AX|S V|I|R|I|AX|S B|I|R|I|AX|S V|EH|R|IH|AX|S B|EH|R|IH|AX|S V|I|R|IH|AX|S B|I|R|IH|AX|S V|EH|R|I|AX|SH B|EH|R|I|AX|SH V|I|R|I|AX|SH B|I|R|I|AX|SH V|EH|R|IH|AX|SH B|EH|R|IH|AX|SH V|I|R|IH|AX|SH B|I|R|IH|AX|SH factors P|AE|K|T|ER|Z F|A|K|T|ER|Z P|A|K|T|ER|Z F|AE|K|T|I R|Z P|AE|K|T|I R|Z F|A|K|T|I R|Z P|A|K|T|I R|Z F|AE|K|T|ER|S P|AE|K|T|ER|S F|A|K|T|ER|S P|A|K|T|ER|S F|AE|K|T|I R|S P|AE|K|T|I R|S F|A|K|T|I R|S P|A|K|T|I R|S of O|V AH|B O|B the D|AX individual I|N|D|AX|V|I|JH|AX|W|AX|L IH|N|JH|AX|V|IH|JH|AX|W|AX|L I|N|JH|AX|V|I|JH|AX|W|AX|L IH|N|D|AX|B|IH|JH|AX|W|AX|L I|N|D|AX|B|I|JH|AX|W|AX|L IH|N|JH|AX|B|IH|JH|AX|W|AX|L I|N|JH|AX|B|I|JH|AX|W|AX|L that D|AE|T DH|A|T D|A|T present P|R|I|Z|AX|N|T P|R|EH|S|AX|N|T P|R|I|S|AX|N|T barriers B|A|R|I|ER|Z B|AE|R|IH|ER|Z B|A|R|IH|ER|Z B|AE|R|I|I R|Z B|A|R|I|I R|Z B|AE|R|IH|I R|Z B|A|R|IH|I R|Z B|AE|R|I|ER|S B|A|R|I|ER|S B|AE|R|IH|ER|S B|A|R|IH|ER|S B|AE|R|I|I R|S B|A|R|I|I R|S B|AE|R|IH|I R|S B|A|R|IH|I R|S to T|O the D|AX invasion I|N|V|E + I|ZH|AX|N IH|N|B|E + I|ZH|AX|N I|N|B|E + I|ZH|AX|N IH|N|V|A|ZH|AX|N I|N|V|A|ZH|AX|N IH|N|B|A|ZH|AX|N I|N|B|A|ZH|AX|N IH|N|V|E + I|SH|AX|N I|N|V|E + I|SH|AX|N IH|N|B|E + I|SH|AX|N I|N|B|E + I|SH|AX|N IH|N|V|A|SH|AX|N I|N|V|A|SH|AX|N IH|N|B|A|SH|AX|N I|N|B|A|SH|AX|N and AX|N|JH multiplication M|O|L|T|AX|P|L|AX|K|E + I|SH|AX|N M|AH|L|T|AX|P|L|AX|K|A|SH|AX|N M|O|L|T|AX|P|L|AX|K|A|SH|AX|N M|AH|L|T|AX|P|L|AX|K|E + I|S|AX|N M|O|L|T|AX|P|L|AX|K|E + I|S|AX|N M|AH|L|T|AX|P|L|AX|K|A|S|AX|N M|O|L|T|AX|P|L|AX|K|A|S|AX|N of O|V AH|B O|B agents. A|JH|AX|N|T|S E + I|JH|AX|N|T|SH A|JH|AX|N|T|SH Susceptible SH|AX|SH|EH|P|T|AX|B|AX|L S|AX|S|I|P|T|AX|B|AX|L SH|AX|SH|I|P|T|AX|B|AX|L host HH|U|S|T HH|O|SH|T HH|U|SH|T