CARACAS, Venezuela (AP) -- Venezuelan President Hugo Chavez is being treated for "respiratory deficiency" after complications from a severe lung infection, his government said, pointing to a deepening crisis for the ailing 58-year-old president. Chavez hasn't spoken publicly or been seen since his Dec. 11 operation in Cuba, and the latest report from his government Thursday night increased speculation that he is unlikely to be able to be sworn in for another term as scheduled in less than a week. "Chavez has faced complications as a result of a severe respiratory infection. This infection has led to respiratory deficiency that requires Commander Chavez to remain in strict compliance with his medical treatment," Information Minister Ernesto Villegas said Thursday night, reading the statement on television. The government's characterization raised the possibility that Chavez might be breathing with the assistance of a machine. But the government did not address that question and didn't give details of the president's treatment. "It appears he has a very severe pneumonia that he suffered after a respiratory failure. It is not very specific," said Dr. Alejandro Rios-Ramirez, a pulmonary specialist in Puerto Vallarta, Mexico, who is not involved in Chavez's treatment. "It does imply the gravity of his pulmonary infection that led to a respiratory failure. It doesn't mean yet that he is breathing with a machine." Dr. Michael Pishvaian, an oncologist at Georgetown University's Lombardi Cancer Center in Washington, said such respiratory infections can run the gamut from "a mild infection requiring antibiotics and supplemental oxygen to life threatening respiratory complications." "It could be a very ominous sign," Pishvaian said. The government expressed confidence in Chavez's medical team and condemned what it called a "campaign of psychological warfare" in the international media regarding the president's condition. Officials have urged Venezuelans not to heed rumors about Chavez's condition. The statement didn't point to any particular rumors but said "this campaign aims ultimately to destabilize the Bolivarian Republic of Venezuela ... and end the Bolivarian Revolution led by Chavez." Venezuela's opposition has demanded that the government provide more specific information about Chavez's condition. Chavez has undergone four cancer-related surgeries since June 2011 for an undisclosed type of pelvic cancer. He also has undergone chemotherapy and radiation treatment. He was re-elected in October to another six-year term, and two months later announced that the cancer had come back. Chavez said before the operation that if his illness prevented him from remaining president, Vice President Nicolas Maduro should be his party's candidate to replace him in a new election. This week, the president's elder brother Adan and National Assembly President Diosdado Cabello joined a parade of visitors who saw Chavez in Havana, and then returned to Caracas on Thursday along with Maduro. "In the past hours, we've been accompanying President Hugo Chavez and taking him the courage and strength of the Venezuelan people," Maduro said on television. Appearing next to Cabello visiting a government-run coffee plant in Caracas, he said they had been with Chavez together with the president's brother, his son-in-law Jorge Arreaza, Oil Minister Rafael Ramirez and Attorney General Cilia Flores. Chavez's health crisis has raised contentious questions ahead of the swearing-in set for Jan. 10, including whether the inauguration could legally be postponed and what will happen if Chavez can't begin his new term. The plans of Chavez's allies remain a mystery.