GENEVA, More than 14 million people in Yemen have no access to health services, the United Nations health agency World Health Organization (WHO) said, warning that transportation of medical personnel and treatment for the injured is getting increasingly difficult as this week the fighting enters its third year.

At least 7,719 people have been killed and 42,922 injured since 19 March 2015, the WHO reported, but the actual numbers are believed to be higher.

"More than half of all health facilities are closed or functioning only partially," Tarik Jasarevic, a WHO spokesperson, told journalists in Geneva.

Jasarevic, who was in Yemen in February, said that at least 274 health facilities had been damaged or destroyed as a result of the conflict, and some 44 health workers either killed or injured.

He noted also a shortage of medicines and specialized staff, such as surgeons, many of whom have fled the country.

"For more than six months, health facilities in Yemen had received no financial support to cover operational costs and staff salaries," the spokesperson said.

As a result, health facilities such as the chemo-dialysis centre in Hudaydah, is on the brink of ceasing operations, as there was no more fuel to run the obsolete chemo-dialysis machines, Jasarevic noted. Without the facility 600 people with kidney failure would likely die.

The long-term impact of the conflict is also having detrimental effects on the country's food system and infrastructure.

Malnutrition is on the rise with close to half-a-million children suffering from severe acute malnutrition, with one out of every two children under the age of five stunted in their growth.

This is "a 200 per cent increase since 2014 - when that number was at 160,000 - raising the risk of famine," said Christophe Boulierac, spokesperson for the UN Children's Fund (UNICEF).

UNICEF estimates that every 10 minutes, at least one child dies in Yemen as a result of preventable causes such as malnutrition, diarrhoea or respiratory tract infections.

In addition to malnutrition, children face malaria and dengue fever, both of which have been on the rise in the past two months. An outbreak of cholera has been contained, Jasarevic said.

WHO, UNICEF and other UN agencies and their partners are providing aid but resources are stretched. For 2017, for example, the health cluster appealed for $322 million.

Meanwhile, Humanitarian coordinator in Yemen, Jamie McGoldrick, denounced a raft of atrocities taking place in Yemen, including reportedly at least 1,540 children killed; 2,450 children injured; and over 1,550 children recruited to fight or to perform military related duties.

Moreover, Hundreds of people have been killed in mosques, markets, funeral wakes, schools and hospitals.