1. The first time a person is infected, it is called primary infection . 2. One year had passed, and they still hadn't healed their primary infections . 3. This exudate is then the source for new rounds of primary infections . 4. They may recur weekly or monthly for approximately 5 years following primary infection . 5. Primary infection does not involve recruitment of specific lymphocytes to the intestinal mucosa.6. Primary infection can also occur in the bones and lungs.7. IgM becomes undetectable 30 90 days after a primary infection , but earlier following re-infections. 8. State health officials said they believed the outbreak of primary infection had peaked last week. 9. These spores cause a secondary infection which is usually less severe than primary infection with ascospores. 10. They also may be used in dealing with air-borne bacterial primary infections , such as pneumonic plague.