Curran was not out at 15 on the first evening of England's intra-squad warm-up match, but took no part in the game after suffering from "sickness and diarrhoea overnight", ECB said in a statement.
The statement further added that Curran was feeling better on Thursday afternoon, but confirmed that he would play no further part in the ongoing warm-up match. He has been monitored by the team doctor and was tested for Covid-19 earlier today.