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LIVE POLIO IRUS VACCINES

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546<br />

Efficacy-Field Evidence<br />

250t<br />

200+<br />

o- -- o TYPE 1<br />

----- o TYPE 2 FED <strong>LIVE</strong> TYPE 1 <strong>POLIO</strong>V<strong>IRUS</strong> VACCINE 1958<br />

¡--- TYPE 3<br />

'- TYPE 1<br />

TYPE 2 NOT FED <strong>LIVE</strong> TYPE 1 <strong>POLIO</strong>V<strong>IRUS</strong> VACCINE 1958<br />

·- TYPE 3<br />

-S<br />

100'<br />

50<br />

10<br />

JANUARY APRIL'MAY JUNE 19558 1959- MARCH JUNE<br />

FIG. 8.<br />

Geometric mean títers of 88 persons age >10 fed live Type 2, Type 1 and Type 3 poliovirus<br />

vaccine in 1959.

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