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Method of Injury. These organisms injure the individual by:

(a) Taking nourishment from his body
(b) Extraction of blood

(c) Mechanical pressure or obstruction
(d) Toxins

(e) Injury to mucous or skin surfaces

Trichinosis

(2) Cause—-Trichinella spiralis--lives in upper part of intestines.
Female bores into the walls of intestines and deposits ova. They
wander through blood anid lymph stream to striated muscles where
they locate ani become “encysted."

(b) Carriers—-Hogs, wild boars, rats, dogs, and cats. To humans by
undercooked and infected pork.

Tape Worms

(a) Cause--Taenia solium (pork), taenia sagmata (beef), fish.

(b) Transmission--By means of larvae of parasites--taken into body by
eating undercooked infected mat.

(c) Prevention--Thoroughly cooked meats--meat inspection.

Hook Worms. An important public health problem.

(a) Cause--One of many species-—Necator Americanus (New World) from
less virula@t old world form.

(b) Source of Infection--Feces of infected persons—~Infected food and
water. Polluted soil.

(c) Mode of Transmissio--Larwal forms pierce skin--trensported through
circulatory system. :

(d) Prevention--(a) Education, (b) Prevention of soil pollution, (c)
Personal hygiene including shoes.

 

X. CARRIERS OF DISEASE

The recognition and control of the so-called healthy carrier of disease
is one of our most difficult public health problems.

Carrier may be defined as an individual who is not suffering from given

DISEASE, BUT WHO HARBORS Ti = DISEASE PRODUCING ORGANISMS IN HIS BODY AND IS
CAPABLE DIRECTLY OR INDIRECTLY OF INFECTING OTHERS.

Classification

(2) Active--one who has had attack of disease md continues to harbor
organisms.
(bo) Passive--one who has never had disease bit harbors organismSe

Diseases--We have been gradually adding to the number of diseases in
which healthy carriers have been demonstrated:

(a) Cholera

(b) Diphtheria

(c} Plague

(ad) Typhoid |

(e) Epidemic meningitis