This means that primary infection cannot necessarily be prevented in nature.
This exudate is then the source for new rounds of primary infections.
They may recur weekly or monthly for approximately 5 years following primary infection.
The adaptive immune response generates memory cells after a primary infection.
In a very small number of patients, the primary infection is on the X4 receptors, and they are often - but not always - fast-progressors.
Research has shown that ascospores are an important source of primary infections in the spring.
It is against them that antibodies are formed during a primary infection.
A similar self-limited illness has been described in adults with primary infection.
Most primary infections resolve spontaneously in a few weeks.
This is usually seen in females, may ulcerate and often occurs 1-20 years after primary infection.