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.
What is mumps? Mumps is an illness caused by a virus. It usually happens in childhood. Mumps are easily spread by airborne droplets from the upper respiratory tract. The disease usually takes 2 to 3 weeks to appear. Since the introduction of the mumps vaccine, cases of mumps in the U.S. are uncommon. What are the symptoms of mumps? Many children have no or very mild symptoms. The following are the most common symptoms of mumps that may be seen in both adults and children: