Russia on Monday sounded an alert of a possible climb in the West Nile virus infections this autumn due to mild temperatures and heavy precipitation, a perfect combination for the mosquitos that carry it. The West Nile virus, originally from Africa, has spread its roots in Europe, Asia and North America.

There are more than 80% of cases of the West Nile fever recorded in Russia's southwest region.

The main way it transmits is through mosquito bites. It leads to a deadly neurological disease in humans; most infected people, do not develop any symptoms.

Scientists are of the view that milder temperatures attributed to climate change could cause diseases such as the West Nile virus to become more widespread.

"In light of favourable climatic conditions this year - an abundance of precipitation... a warm and long autumn, a high number of (virus) carriers could be observed in the autumn," Reuters quoted Rospotrebnadzor, Russia's consumer health watchdog, as saying.

The World Health Organization (WHO) said that the virus causes West Nile fever in around 20% of cases. The virus is related to the Zika, dengue and yellow fever viruses.

As per the world health body, there is no vaccine against the virus in humans. Albeit a vaccine exists for horses.

According to the United States Centre for Disease Control and Prevention, the West Nile virus (WNV) is the leading cause of mosquito-borne disease in the continental US.

The WNV cases commonly occur during mosquito season that begins in the summer and continues through fall.

About 1 in 5 people who are infected exhibit a fever and other symptoms. About 1 out of 150 infected people exhibit a serious, sometimes fatal, illness.

CDC advises visiting a healthcare provider if you exhibit the symptoms. Since there are no vaccines or medicines available for the virus, general pain relievers can be used to bring down the fever and reduce the symptoms. However, if the symptoms are severe, the patient should be hospitalised.