The Egyptian Ministry of Health and Population has reported 67 cases of a mysterious disease causing fever and fatigue in Qena, it said on Sunday.

"In light of the current situation, Rospotrebnadzor has tightened sanitary and quarantine controls with respect to flights from Egypt, including using the Perimeter automated information system," it said in a statement reported by the Russian news agency TASS on Monday.

The Egyptian health ministry urged calm, stressing that all cases reported in Qena have exhibited mild to moderate symptoms, with no severe cases or hospitalizations reported thus far.

Symptoms include body aches, fever, and, in some cases, vomiting and nausea, according to Assistant Minister of Health for Preventive Medicine Affairs Amr Qandil.

The Russian watchdog said symptoms of the disease resemble those of dengue fever, adding that it is in contact with the Egyptian side and international organizations to learn more about the disease.

Dengue fever is a vector-borne disease transmitted through infected mosquito bites, and in severe cases, it can be life-threatening, according to the World Health Organization (WHO).

The disease is not common in Egypt, but is not unheard of.

In 2017, several hundred cases requiring hospitalization were documented in the Red Sea governorate city of El-Qusair.

Rospotrebnadzor also urged tourists planning to vacation in Egypt to take precautions to avoid getting insect-borne infectious and parasitic diseases, including wearing clothing that protects the skin, using mosquito repellents, and putting mosquito nets over doors and windows.