Acut ebr onchi t i s ,whi ch l as t sf or1weekt oamont h, i sus ual l ycaus edbycol d oruvi r us es .Acut e br onchi t i scanbe cont agi ous ,s i ncecol dand uvi r us esar econt agi ous .
8
mi l l i o n
Over8mi l l i onpeopl ear e di agnos edwi t hchr oni c br onchi t i speryear
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Chr oni cbr onchi t i s ,whi ch l as t sf ormont hsorl onger , i sus ual l ycaus edby i r r i t ant ss uchasci gar et t es ordus t .Chr oni cbr onchi t i s i snotcont agi ous .
1 0
mi l l i o n
Over1 0mi l l i onpeopl e haveacut ebr onchi t i s ever yyear