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 causes a neck mass? Neck masses are common in adults and can occur for many reasons. Adults may develop a neck mass due to a viral or bacterial infection. Ear or sinus infection, dental infection, strep throat, mumps, or a goiter may cause a neck mass. If a neck mass is from an infection, it should go away completely when the infection goes away.