(a) spread/healthy carriers/some/of/diseases/are/germs/spread/by
(b) healthy person/germs/a/carry/may/of/in/body/typhoid/his/cholera/dysentery/etc.
(c) person/does not/such/usually/a/disease/suffer/the/from
(a) Some diseases are spread by healthy carriers of germs.
(b) A healthy person may carry germs of typhoid, cholera, dysentery, etc. in his body.
(c) Such a person usually does not suffer from the disease.