Asian Journal of Medicine and Health

The pregnancy process involves many physiological changes, including weight gain, hormonal, metabolic and immune changes. One of the effective factors in this process is infection caused by microorganisms. Originally, before the advent of antibiotics, pregnancy was known as a risk factor for severe complications of pneumococcal pneumonia. Among viral infections, the 2009 flu pandemic issued a newer warning that some infections may disproportionately affect pregnant women and cause miscarriage and its complications during pregnancy. Generalization of pregnancy as a condition of suppression of the general immune system or increased risk is misleading and prevents the establishment of adequate guidelines for the treatment of pregnant women during epidemics. Viral infection has also become an important factor in pregnancy conditions. The recent outbreak of Ebola and other viral outbreaks and epidemics shows how pregnant women show worse outcomes (such as preterm delivery and fetal adverse outcomes) than the general population and non-pregnant women. The purpose of this article is studying pathogenesis of microorganisms and the risks which pose to the mother and the fetus. In order to investigate these factors, from 120 article prepared from google scholar and Pub med, Elsevier database. Knowing these factors can increase the ability to treat the infections in a timely manner and prevent their effects on the fetus and the patient.