438.Denominator while calculating the secondary attack rate Includes:
a. All the people living in next fifty houses
b. All the close contacts
c. All susceptible amongst close contact
d. All susceptible in the whole village
437. The Vipeholm study revealed the effect of various diet factors on dental decay? The occurrence of dental caries is most dependent on which factors
a. Amount and form of diet
b. Form and Frequency of diet
c. Amount and Frequency of diet
d. All of the above
c. Amount and Frequency of diet
d. All of the above
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