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 Causes. Mumps is mainly caused by a virus. The incubation period (from initial infection to symptoms) is from 16-18 days, ranging from 12-25 days after exposure. The period when someone is most infectious to others is from one to two days before and five days after the onset of swelling in the glands.umps is a disease, usually of children, caused by a virus. With mumps, your salivary glands swell. Specifically, these are the parotid glands, and they are located below and in front of each ear. The virus is spread by direct contact with an infected person's sneeze or cough. Humans are the only known natural hosts.