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>The CDC investigators formed part of a team that was conducting house-to-house interviews in the area of the derailment last month, according to authorities. They immediately reported their symptoms to federal authorities after they fell ill.

>"Symptoms resolved for most team members later the same afternoon," the CDC said in a statement. "Everyone resumed work on survey data collection within 24 hours. Impacted team members have not reported ongoing health effects."

>In the wake of the derailment, state and federal officials repeatedly sought to reassure East Palestine residents that local air and water supplies were safe. Residents, however, reported headaches, nausea, burning eyes and sore throats, sparking fears that their long-term health could be impacted.

>Environmental officials have said that nearly 45,000 animals died as a result of the toxic train crash, although all were aquatic species.

>One of the chemicals that the train was carrying, vinyl chloride, is a colourless, hazardous gas that is primarily used to make PVC plastic. It is also a known carcinogen and acute exposure is linked to dizziness, drowsiness and headaches. Prolonged exposure can cause liver damage and a rare form of liver cancer.

>On Thursday, the US Department of Justice filed a lawsuit against the company that operated the train - Norfolk Southern - over environmental damage caused by the derailment.

>The justice department said it plans to hold the company responsible for "unlawfully polluting the nation's waterways and to ensure it pays the full cost of the environmental cleanup," the lawsuit states.

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