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