Of the forty-two, 36 patients have been hospitalized, including five patients placed on ventilators.

Two patients died of the virus on Monday at Petah Tikvah’s Beilinson Hospital, raising the number of fatalities to four.

West Nile Virus is a mosquito-borne virus that causes West Nile fever. Most carriers of the virus never develop symptoms. About 20% of those infected have symptoms of varying severity, including fever, general malaise, headaches or generalized body aches. Neurological complications appear in less than 1% of those infected.