Eastern Europe / Africa / Medical Microbiology / Toxoplasmosis / Spain / Syphilis / Latin America / Pregnancy / Hepatitis B / Less developed countries / Humans / Female / Asia / Rubella Virus / Prevalence / Pregnant Women / Enfermedades / Cross Sectional Studies / Syphilis / Latin America / Pregnancy / Hepatitis B / Less developed countries / Humans / Female / Asia / Rubella Virus / Prevalence / Pregnant Women / Enfermedades / Cross Sectional Studies