(Corrects to say Egyptian case was first reported on Saturday)
RIYADH, May 1 (Reuters) - Saudi Arabia said on Thursday the total number of cases of Middle East Respiratory Syndrome (MERS), an often deadly new disease, had nearly doubled in the kingdom in April with 26 more infections reported on Tuesday and Wednesday.
The first case of the disease in Egypt was reported on Saturday, in a 27-year-old man who lives in Saudi Arabia but returned ill to Egypt last week after having been in contact with an uncle in the kingdom who died of MERS.
International concern about the disease is acute because Saudi Arabia is expected to receive large numbers of foreign pilgrims during the fasting month of Ramadan in July, followed by millions more for Islam's annual haj pilgrimage in October.
Although the WHO has said the disease, from the same family as the SARS virus, is difficult to pass between humans, most of the cases reported in Saudi Arabia so far appear to have been transmitted between people rather than from animals.
A team of WHO experts has arrived in Saudi Arabia and is working with authorities on boosting infection control measures, particularly in hospitals, and studying how the virus spreads.
Seven of the new cases were in Jeddah, four in Mecca, 10 in Riyadh, two in the northern town of Tabuk and one each in Hafr al-Batin near Kuwait and Najran near Yemen. Two people, who had previously been confirmed as suffering from the disease, died.
The new cases have taken the total number of confirmed infections in Saudi Arabia to 371, a jump of 89 percent during the month of April. Most of the new infections last month came in an outbreak in three hospitals in Jeddah.
Of people who caught the disease in Saudi Arabia, 107 have died since it was identified two years ago.
But health experts believe the initial source of transmission was from an animal reservoir, probably camels. On Tuesday, acting health minister Adel Fakeih said Saudis should avoid close contact with camels or consuming their raw milk or meat.
Traders and other people at Riyadh's camel market on Monday told Reuters they had not been officially notified or warned about the likely connection between MERS and camels and had been taking no extra precautions such as increased hand washing.
The WHO said last week it was advisable to be careful around camels, and international infection experts have been pointing to the link between the animals and the disease for months.
Although Saudi Arabia and the WHO have advised very old people, children and those suffering long-term disease to delay their haj this year because of MERS, they have stopped short of imposing other restrictions such as on visa numbers.
Countries including Qatar, Kuwait, Jordan, the United Arab Emirates, Oman and Tunisia as well as several countries in Europe have reported MERS cases since the virus emerged.
The World Health Organisation announced the Egyptian case on its website, saying it was the first laboratory-confirmed case of MERS reported by authorities there. It said the 27-year-old man was in stable condition. (Reporting by Angus McDowall in Riyadh; additional reporting by Stephanie Nebehay in Geneva; Editing by Hugh Lawson/Mark Heinrich)