London, Sep 28 (IANS) Liberia's chief medical officer has put herself under quarantine for 21 days, after one of her assistants died from the Ebola virus.

Liberia's deputy health minister Bernice Dahn Saturday said that she had no symptoms but wanted to take every precaution, BBC reported.

She said she had not come into contact with any other infected people, apart from the office assistant who died this week, but wanted to take every precaution.

The World Health Organization (WHO) says more than 3,000 people have died from Ebola in West Africa.

Liberia has been the worst hit by the disease, accounting for 1,830 deaths - 150 in the last two days alone.

According to WHO reports, 375 workers are known to have been infected, and that 211 have so far died from the virus in Guinea, Liberia, Nigeria and Sierra Leone.

Health workers have been particularly vulnerable to the virus, which is spread by the infected body fluids of patients.

Health organisations recommend isolating people for at least 21 days, which is the maximum incubation period for the virus.