Text a Parasitic Gastritis

1. The most important stomach worms are (1) Haemonchus placei (large stomach worm or wire worm), (2) Ostertagia ostertagi (medium stomach worm or brown stomach worm) and (3) Trichostrongylus axei (small stomach worm).

2. The adults of Haemonchus vary in length from 3/4 to 1 1/2 inches. Ostertagia adults are approximately 1/4 inch in length and Trichostrongylus about 1/2 inch. All three have very similar life cycles.

3. Infective larvae vary in their resistance to environmental factors, but those of Ostertagia are more resistant than those of the other two genera, especially to low temperatures.

4. Symptoms. Since all three of these stomach worms are bloodsuckers, anemia is one of the most outstanding symptoms of parasitic gastritis. The anemia will vary greatly in degree, but it is usually less marked in Trichostrongylus infections and most marked in heavy Haemonchus infections. Digestive disturbances are common. A persistent and profuse watery diarrhea almost always accompanies heavy Ostertagia and Trichostrongylus infections. Other symptoms include progressive loss of weight, weakness, rough hair coat, anorexia and dehydratation.

5. Control. In preventive control it is necessary that none of the basic causes of the development of clinical parasitism be allowed to exist in a herd. These conditions are:

1) the initial exposure to a large number of infecting organisms;

2) lowered resistance as the result of malnutrition or recent infections.

6. In corrective control it is necessary to keep the animals alive by specific or symptomatic therapy until these conditions can be corrected. Chemotherapy is a major part of the correction of parasitic gastritis in a herd.

Vocabulary List

Verbs

to allow

to vary

Nouns

control

degree

disturbance

exposure

genus

hair

resistance

symptom

weight

worm

Adjectives

basic

environmental

less

Pronoun

none

Preposition

since

Ex. 21. Answer the following questions on Text A in English.

What are the most important stomach worms?

How do the worms vary in length?

How do the infective larvae vary in their resistance to environmental factors?

What are the basic symptoms of parasitic gastritis?

What kind of diarrhea accompanies the disease?

What is necessary in preventive control?

What is necessary in corrective control?

Is chemotherapy a major part of the correction of the problem of parasitic gastritis in a herd?

Ex. 22. Characterize the disease of parasitic gastritis in Russian.

Ex. 23. Translate from English into Russian.

The most important stomach worms are large stomach worms and medium stomach worms.

Infective larvae vary in their resistance to environmental factors.

Medium stomach worms are more resistant than those of the other genera.

Anemia is one of the basic symptoms of parasitic gastritis.

In men and animals digestive disturbances are common, especially a persistent and profuse watery diarrhea.

Other symptoms in parasitic gastritis are progressive loss of weight, weakness, anorexia and dehydratation.

In preventive control it is necessary to keep animals alive by specific or symptomatic therapy.

Chemotherapy is a major part of the correction of the problem of parasitic gastritis in a herd.