Thus, the chronic effects of imidacloprid in the field is still unknown.

The more chronic effects include cancer and birth defects.

"One can't really be an expert, but in general this class has very low toxicity and is not thought to have chronic effects," she said.

She agreed, though, that any chronic long-term effects of exposure to Galecron would not be picked up.

Exxon scientists have not found any chronic effects from oil because they did not want to.

Some chronic effects of formic acid exposure have been documented.

Their toxicity is not limited to the acute phase, however, and chronic effects have long been noted.

Oil in even minute concentrations can kill fish or have various sub-lethal chronic effects.

Relatively low doses of contaminants in water, food, and environment can already have significant chronic effects if there is a long-term exposure.

Report of two patients with acute and chronic effects.