Poisoning can occur from ingestion, inhalation, or skin absorption. Uranyl fluoride is corrosive and harmful upon inhalation, ingestion, or skin absorption. Exposure occurs through inhalation, ingestion or occasionally skin contact. OP pesticide exposure occurs through inhalation, ingestion and dermal contact. Aniline is toxic by inhalation of the vapour, ingestion, or percutaneous absorption. Physical contact, ingestion or inhalation can cause health problems. Lead sulfate is toxic by inhalation, ingestion and skin contact. Treatment is similar to poisoning caused by oral ingestion. Symptoms of ricin inhalation are different from those caused by ingestion. The ingestion of iodine prevents iodine deficiency. This can occur through inhalation, ingestion, or injection. Lead enters the body via inhalation, ingestion, or skin absorption. Organophosphosphate pesticides can be absorbed by all routes, including inhalation, ingestion, and dermal absorption. Nausea and vomiting are also problems which might arise with topical fluoride ingestion. Serious symptoms of overdose generally occur within an hour of ingestion.