ADEN, May 11 (Reuters) - Yemeni authorities declared Aden, interim seat of the Saudi-backed government, an “infested” city on Monday after the number of coronavirus cases there jumped to 35, with four deaths.

A five-year war has shattered Yemen’s health system, pushed millions to the brink of famine and divided the country between the internationally recognised government and the Houthi group that ousted it from power in the capital, Sanaa, in late 2014.

The Aden-based national coronavirus committee late on Sunday announced 17 new COVID-19 cases, 10 of them in the southern port city, to raise the total count in areas under the Saudi-backed government’s control to 51 with eight deaths.

The Houthi movement, which controls Sanaa and most large urban centres, has only reported two cases, with one death. The Aden-based government has accused Houthi authorities of covering up an outbreak in Sanaa, an accusation they deny.

The World Health Organization says there is full-blown transmission of the virus in Yemen, whose population has some of the lowest levels of immunity to disease compared with other countries. Testing capabilities are inadequate.

The Aden-based committee said Aden had been declared an “infested city” due to the spread of the coronavirus and other diseases after recent flooding. It said movement from Aden to other regions was barred with the exception of the transport of goods.

“The administrative and political situation in Aden is also hampering efforts to combat the coronavirus and this should be remedied so relevant entities can carry out their duties,” the committee said on its Twitter account.