Although a viral infection can be acquired by anyone regardless of their sex, women’s organism in many aspects is weaker than men’s in terms of immune protection which results in more frequent infestation with viral infections and their flare-ups. The degree of opposition to infection is influenced by physical health, mental factors, and endocrine background. Women are usually physically weaker and less trained; they are more often subjected to stress, fluctuations in hormonal levels and have special physiological periods of reduced immunity – pregnancy and childbirth. Viral infections in women can manifest with all usual symptoms or have a latent form, i.e. be hidden most of the time and flare up from time to time. The hidden viruses are especially dangerous when planning pregnancy and carrying a baby because they can exist without any symptoms but seriously harm an unborn baby.