11. "Treponema pallidum " invades the nervous system within three to eighteen months after the primary infection . 12. The drug primarily works on cells in the lungs, the primary infection site for the flu virus. 13. Rheumatic fever is a nonsuppurative sequela of a primary infection of group A " Streptococcus " bacteria. 14. It is not known whether TS represents new primary infection or opportunistic reactivation of a latent infection. 15. During primary infection , the level of HIV may reach several million virus particles per milliliter of blood. 16. After primary infection , zoospores serve as a main source of inoculum throughout the rest of the season. 17. The source of primary infection remains unknown. 18. While primary infection is often accompanied by a self-limited period of clinical illness, long-term latency is symptom-free. 19. Primary infection is thought to be autolimited and almost asymptomatic as histoplasmosis or coccidioidomycosis ( valley fever ).20. The intensity of conidia showers directly relates to the percentage of bloom and shoots with primary infection symptoms.
