Long Guangqing drinks mountain spring water to quench his thirst on his way to visiting a patient at home on May 27.

Long Guangqing ferries the boat on his way to visiting a patient at home on May 27.

Long Guangqing ferries the boat on his way to visiting a patient at home on May 27.

Long Guangqing ferries the boat on his way to visiting a patient at home on May 27.

Long Guangqing docks his ferry at the river bank on May 27.

Long Guangqing walks to a patient's home on May 27.

Long Guangqing (right) explains the precautions needed before taking medicine to a villager on May 27.

Long Guangqing (right) takes a villager’s blood pressure on May 27.

Long Guangqing prepares to give an injection to a patient on May 27.

Long Guangqing walks home on May 27.

Long Guangqing walks home on May 27.