An estimated 20 million people were treated for illnesses such as asthma, bronchitis, emphysema, eye irritation, and cardiovascular diseases, while those who couldn't afford medical care went uncounted. The number of excess deaths from this months-long episode is unknown. Unable to see through the thick haze, several boats collided in the busy Straits of Malacca, and a plane crashed on Sumatra, killing 234 passengers. Cancelled airline flights, aborted tourist plans, lost workdays, medical bills, and ruined crops are estimated to have cost countries in the afflicted area several billion dollars. Wildlife suffered as well. In addition to the loss of habitat destroyed by fires, breathing the noxious smoke was as hard on wild species as it was on people. At the Pangkalanbuun Conservation Reserve, weak and disoriented orangutans were found suffering from respiratory diseases much like those of humans.