This study was aimed to asses knowledge of prevention of mother to child transmission of HIV among reproductive age women and associated factors at Mecha district, North West Ethiopia. A community based cross sectional study was conducted among 853 reproductive age women from July 1- 30/2016 in Mecha district. By multistage sampling technique data were collected through pre-tested questionnaire. The collected data was entered in Epi Data 3.1 and analyzed with SPSS version 20. Bivariate and multivariable logistic regression model were used.
About 22.4% of the respondents were knowledgeable on prevention of mother to child transmission (PMTCT) of HIV. Having knowledge on PMTCT of HIV was significantly associated with urban residence (AOR = 2.486, 95% CI 1.160–5.328), education level of secondary and above (AOR = 5.445, 95% CI 2.698–10.986), those having history of antenatal care followup (AOR = 4.430, 95% CI 1.471–13.340), those with history of institutional delivery (AOR = 4.766, 95%CI 2.004–11.334), those having comprehensive knowledge on HIV/AIDS (AOR = 1.697, 95%CI 1.011–2.846), women who were knowledgeable about mother to child transmission of HIV (AOR = 2.203, 95% CI 1.37–3.54), and women who held discussions with their husband regarding HIV/AIDS, (AOR = 2.700, 95% CI 1.658–4.396).