* Second case was neighbour of deceased teenager
* More than 100 contacts of teenager identified-WHO
* Ebola has killed more than 11,200 people in West Africa (Adds details, quotes, writes through)
By James Harding Giahyue
NEDOWEIN, Liberia, July 1 (Reuters) - Liberia confirmed a second new case of Ebola on Wednesday and warned of possible new infections, as the re-emergence of the virus nearly two months after its elimination in the West African country raised fears of hidden pockets of the disease.
More than 11,200 people have died since last year in the worst Ebola outbreak on record, nearly all of them in the three neighbouring countries of Liberia, Sierra Leone and Guinea.
Liberia, where 4,800 people perished, had been viewed as a rare success story, having been declared Ebola-free on May 9.
But the confirmation on Tuesday of an Ebola case in a rural area of Margibi County, about 50 km (30 miles) from the capital Monrovia, raised fears of a resurgence of the disease.
The World Health Organization (WHO) said Liberian authorities were monitoring more than 100 people thought to have come into contact with Abraham Memaigar, who died on Sunday.
The 17-year-old, initially misdiagnosed with malaria, was buried the same day but tests on his body later confirmed his infection. A neighbour later tested positive as well.
“We have two confirmed cases today in Liberia,” Dr. Moses Massaquoi, case management team leader for Liberia’s Ebola task force, said on Wednesday.
Liberian officials and the WHO said the teenager was not believed to have travelled to Sierra Leone or Guinea. Margibi County is far from the epidemic’s remaining hotspots.
Some residents of Memaigar’s village said that those showing symptoms of Ebola had recently eaten a dog, a practise common in Liberia. In past outbreaks, humans have been infected by eating monkey flesh.
“This might mean that there is a reservoir of Ebola in animals that we have not been paying attention to,” said Dr. Philip Ireland, at John F. Kennedy medical centre in Monrovia, an Ebola survivor. “It could pop up anywhere.”
In the village of Nedowein, Memaigar’s mud-brick home was under quarantine Wednesday. Health officials wearing rubber boots and gloves went house-to-house talking to residents confined to their homes.
“At present we have four people of high risk that have been taken to...Monrovia. They are all from the community. These are at high risk,” said John Sumo, a member of the incident management team.
An internal Liberian health report showed that Memaigar had attended school, visited a local clinic and travelled to his father’s house in a nearby village in the week before he died.
Ebola, spread through bodily fluids, is most contagious in the late stages when victims can suffer bleeding from the eyes and ears as well as vomiting and diarrhoea.
The disease can remain present in semen long after a patient is cured. It is also possible that the new infections resulted from a previously unidentified pocket of the disease. Ebola is now believed to have been present in an area straddling the three countries long before the current outbreak was identified.
“It is likely that we’ll find additional cases ... and if there are others, it would still be a cluster, just as there have been clusters for 40 years,” said Dr. Bernice Dahn, chief medical officer at Liberia’s Ministry of Health.
Liberia helped to control the epidemic with the help of U.S. military assistance and hundreds of millions of dollars in aid. Most of those troops have now left the country however.
“It is like being kicked in the gut but at least we knew it might be coming,” said Sheldon Yett, the representative for the United Nations children’s agency UNICEF in Liberia.
“People have gotten into gear. There’s no panic.” (Additional reporting by Alphonso Toweh in Monrovia and Emma Farge in Dakar; Writing by Emma Farge and Joe Bavier; Editing by Daniel Flynn and Peter Graff)