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LIVE POLIO IRUS VACCINES

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Experimental Infectionwith CHATAttenuated Poliovirusin Premature Infants 289<br />

TABLE 2. BIRTH-WEIGHT, INTESTINAL INFECTION, AND DURATION OF EXCRETION OF V<strong>IRUS</strong><br />

BIRTH-<br />

WEIGHT<br />

INFECTED<br />

INTESTINALLY<br />

DURATION OF EXCRETION<br />

MEAN<br />

(WEEKS)<br />

RANGE<br />

(Grams)<br />

990 to 1200<br />

100% (8)*<br />

4 (4)<br />

2 to 6<br />

1201 to 1800<br />

91% (19)t<br />

3-1/2 (6)<br />

3 to 6<br />

1801 to 2100<br />

90% (17)t<br />

3 (7)<br />

1-1 /2 to 9<br />

* Number of infants in parentheses.<br />

t Two infants in this weight group were not infected.<br />

TABLE 3. TRANSPLACENTALLY ACQUIRED ANTIBODIES, INTESTINAL INFECTION, AND DURATION OF<br />

EXCRETION OF V<strong>IRUS</strong><br />

CORD-BLOOD<br />

TITER*<br />

INFECTED<br />

INTESTINALLY<br />

DURATION OF EXCRETION<br />

MEAN<br />

(WEEKS)<br />

RANGE<br />

512-256<br />

90o% (9)t<br />

3 (5)<br />

1-1/2 to 7<br />

128-64<br />

83% (10)<br />

4-1/2 (5)<br />

3 to 9<br />

32-16<br />

91% (10)<br />

3-1/2 (3)<br />

1-1/2 to 7<br />

8-

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