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175.

The basic immunization schedule with a DTwP vaccine (containing a whole-cell pertussis element) includes:

A. 1st dose at 1 month, 2nd dose at 2-3 months, 3rd dose at 5-6 months., 4th dose at 16-18 months.
B. 1st dose at 1 month, 2nd dose at 3-4 months, 3rd dose at 5-6 months., 4th dose at 12-14 months.
C. 1st dose at 2 months, 2nd dose at 3-4 months, 3rd dose at 5-6 months., 4th dose at 12-14 months.
D. 1st dose at 2 months, 2nd dose at 4 months, 3rd dose at 5-6 months., 4th dose at 16-18 months.
E. 1st dose at 2 months, 2nd dose at 5 months, 3rd dose at 6-7 months., 4th dose at 16-18 months.

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