As folate is vital in the first trimester of pregnancy for healthy fetal development, the use of antifolates is strongly contraindicated in pregnancy and carries significant teratogenic risk. Low doses of methotrexate can deplete folate stores and cause side-effects that are similar to folate deficiency.
Cause of Adult Mumps. Adult mumps is caused by an infection with the mumps virus, which is found worldwide. The mumps virus is an RNA (ribonucleic acid) virus from the family Paramyxovirus of the genus Rubulavirus. The mumps virus only infects humans.
Mumps is caused by the mumps virus, which belongs to a family of viruses known as paramyxoviruses. These viruses are a common source of infection, particularly in children.When you get mumps, the virus moves from your respiratory tract (your nose, mouth and throat) into your parotid glands (saliva-producing glands found either side of your face), where it begins to reproduce. This causes the glands to swell.ow mumps is spread. Mumps is an airborne virus and can be spread by: 1  an infected person coughing or sneezing and releasing tiny droplets of contaminated saliva, which can then be breathed in by another person.