title: Decreased levels of helper T cells in pregnancy.
mesh_terms: D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D007958:Leukocyte Count; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D006377:T-Lymphocytes, Helper-Inducer