Figure 1.

Text message response rates by day post-vaccination and response types. (A) Day 0–2 responses to text messages assessing fever; (B) Day 7–42 responses to text messages assessing short-term adverse events temporally associated with vaccination; (C) Day 70–245 responses to text messages assessing health events through the end of pregnancy, and pregnancy and neonatal outcomes.

Note: Response rates end on Day 245 due to having fewer than five participants from Day 252–259. Denominator includes all women who had not yet reported a pregnancy outcome who were still within 2 weeks of their estimated due date.