High initial levels of exposure, rather than low persisting exposures, may be associated with the highest effects.
Persistent infection: the presence of at least one variant present in the pretreatment sample persisting after exposure to treatment.
Dr. Ana Navas-Acien, main author of a 2006 review of the scientific literature on the relationship between lead and cardiovascular disease, said that available research doesn't indicate how long symptoms persist after exposure stops.
We were able to demonstrate a risk which persisted after exposure and time trend analyses which indicated signals had the potential to be picked up early.
The contraction that persisted after exposure to ET-1 and that was transiently inhibited by ET-receptor antagonists (Fig. 1E/F) or by acetylcholine (Fig. 3B/C), was terminated by capsaicin and by CGRP (Fig. 3B/C).
Ongoing concerns persist about exposure from the Kiteezi landfill in Kampala, the country's capital.
Even if carriage persists after exposure, and the risk of infection increases, infection is not assured (Davis et al. 2004).
Although lead levels have declined in the United States and other industrialized nations, low-level lead exposures still persist, and exposure from higher lead levels in the past is likely.
How long a low level of P. falciparum parasitemia may persist once exposure to malaria has been discontinued is not known.
