Dozens of people in Karachi tested positive to swine flu after the contagious disease claimed several lives in South Punjab.

H1N1 or swine flu is an infectious disease that is transmitted from one person to the other. Its signs and symptoms in humans are similar to those of other flu strains like fever, cough, sore throat, running nose, body aches, headaches and fatigue. Swine flu patients also report diarrhoea and vomiting.

Doctors say that as soon as the symptoms become evident, the patients should take rest, cover their mouth with tissue while coughing and sneezing and later throw the tissue paper after using it only once.

Medical experts say that swine flu proves to be deadly for the patients who possess low levels of immunity in their body. However, it is more fatal for children and elderly people.

If the immune system gets weakened by swine flu, the patient dies after suffering from pneumonia. Therefore; medicines are prescribed to increase the immune levels in the body.

At least four people have been killed due to Swine flu in Multan while the number of patients keep on mounting in other cities of Punjab. As per reports, eight people were killed while 75 received the virus in 2016 in the metropolis.

In 2009-10, the H1N1 swine flu pandemic spread from central Mexico to 74 other countries including India, killing an estimated 284,000 people, according to the U.S. Centers for Disease Control and Prevention.

More than 2,700 died in India of swine flu between May 2009 and December 2010. Last year, India recorded 218 swine flu-related deaths and 937 cases, down from 2013, when 699 died.