OCR Text |
Show Tuberculoses All animals'hnve a certain degree of resistance to the attack of the germ of T. B. ; in some this power Is low u'nd others very high. The guinea pig. for example, litis abuost no resistance to tlds disease, wh:.e the goat has so high a resistance that It is very hard to infect it at till. Among human beings be-ings the Indian and negro usually show a very low resisting power and when infected are apt to have the rapid and dangerous form of th;s. trouble. trou-ble. The average white man, on the contrary, has considerable resisting power. |