A thermal camera monitors the body temperature of a passenger arriving to Tocumen International airport in Panama City October 15, 2014. Panama has stepped up precautionary measures against Ebola across the Central American country after the United States confirmed Wednesday a second Texas healthcare worker has tested positive for the virus. According to official tallies, more than 4,000 people have died from the Ebola outbreak thus far, and the fatality rate among the infected has been measured at 70 percent, according to the World Health Organisation. REUTERS/Rafael Ibarra (PANAMA - Tags: TRANSPORT HEALTH SOCIETY) 

Health workers check passengers returning from haj pilgrimage in Saudi Arabia, at Cairo Airport, October 13, 2014. REUTERS/Asmaa Waguih 

A health worker checks the temperature of a woman entering Mali from Guinea at the border in Kouremale, October 2, 2014. REUTERS/Joe Penney 

A health worker checks the temperature of a woman entering Mali from Guinea at the border in Kouremale, October 2, 2014. REUTERS/Joe Penney 

A medical personnel looks at a screen while checking temperatures of passengers arriving at Aleksandar the Grate airport in Skopje, Macedonia, October 10, 2014. REUTERS/Ognen Teofilovski 

A health worker checks the temperature of a woman leaving Guinea at the border with Mali in Kouremale, October 2, 2014. REUTERS/Joe Penney 

A female immigration officer uses an infrared digital laser thermometer to take the temperature of a female passenger at the Nnamdi Azikiwe International Airport in Abuja, Nigeria, August 11, 2014. REUTERS/Afolabi Sotunde 

A health worker checks the temperature of a baby entering Mali from Guinea at the border in Kouremale, October 2, 2014. REUTERS/Joe Penney 

A school official takes a pupil's temperature using an infrared digital laser thermometer in front of the school premises, at the resumption of private schools, in Lagos, Nigeria, September 22, 2014. REUTERS/Akintunde Akinleye 

A school official takes a pupil's temperature using an infrared digital laser thermometer in front of the school premises, at the resumption of private schools, in Lagos, Nigeria, September 22, 2014. REUTERS/Akintunde Akinleye 

A man has his temperature taken using an infrared digital laser thermometer at the Nnamdi Azikiwe International Airport in Abuja, Nigeria, August 11, 2014. REUTERS/Afolabi Sotunde 

A health worker checks the temperature of a baby entering Mali from Guinea at the border in Kouremale, October 2, 2014. REUTERS/Joe Penney 

A boy's temperature is taken using an infrared digital laser thermometer at the Nnamdi Azikiwe International Airport in Abuja, August 11, 2014. REUTERS/Afolabi Sotunde