Co-administration of paediatric vaccines in Shanghai, China

- Immunization clinics in Shanghai informally discourage vaccine co-administration.
- Less than 20% of DTP, OPV, Hib vaccine, PCV, and rotavirus vaccine were co-administered.
- Non-locals had more co-administration than locals.
- Co-administration increased over time.
- More co-administration could lead to greater timeliness and higher vaccine uptake.