HAVANA, June 15 (Xinhua) -- The sole survivor of the Cuban plane crash that killed all of the other 112 people on board on May 18 remained in serious condition on Friday, though doctors said she has made progress.

Maylen Diaz, 19, had stabilized breathing, after initially relying on a mechanical ventilator, according to Dr. Carlos Alberto Martinez, director of the Calixto Garcia General Hospital in Havana.

Diaz was also interacting more with her medical team, said Martinez, adding that the patient showed "good integration of her cognitive-affective sphere."

Diaz also showed "progress in responding to treatment," and doctors had succeeded in controlling infection present in her wounds with antibiotics, Martinez said.

Cuban authorities are still investigating what caused the Boeing 737 to crash and burst into flames shortly after taking off around noon from Havana's Jose Marti International Airport.

The plane, leased by local company Cubana de Aviacion from the Mexican airline Damojh, was en route to Holguin in eastern Cuba.

The tragedy claimed the lives of the six-member Mexican crew and the remaining 106 passengers, mostly Cubans.

Nearly all of the victims were killed on impact or in the resulting fire. Two other women rescued alive along with Diaz died while receiving treatment in hospital.