LIVE POLIO IRUS VACCINES

Vaccination of Full-Term Infants with Attenuated Polioviruses 295
TABLE 1.
TABLE 2.
GEOMETRIC
POLIOVIRUS
MEAN HALF-LIVES OF
ANTIBODY
Virus Number nf Geometric Mean
Type Determinations 1alf-Life (Days)
1 9 17
2 17 18
3 9 18
All 35 18
Arithmetic Mean = 19
Standard Deviation = + O
AGE AT VACCINATION IN RELATION TO
INTESTINAL INFECTION WITH ATTENUATED POLIO-
VIRUSES
Age Positive Intestinal Infections
(Days) Ratio Per Cent
TABLE 4. INTESTINAL INFECTION IN RELATION
TO LEVEL OF TRANSPLACENTALLY ACQUIRED ANTI-
BODIES IN INFANTS LESS THAN 70 DAYS OLD
Homotypic Antibody Infections Established
Titer at Vacc. Ratio Per Cent
512-256 9/9 100
128-64 14/21 67
32-16 22/25 80
8-