(CNN) -  As rumors about Venezuelan President Hugo Chavez's
health swirl, supporters and opponents of the ailing leader are
trading barbs over who is behind them.  "Secrecy is the source
of the rumors that increase uncertainty and cause anguish,"
opposition leader Ramon Guillermo Aveledo told reporters Monday,
calling on the government to release more details about Chavez's
current health situation and his prognosis.  Chavez, 58, has not
been seen publicly since he underwent cancer surgery in Cuba
more than three weeks ago. Government officials have said he's
suffering from complications connected to a respiratory
infection, but they have not revealed additional details or
specified the type of cancer he has.  "Our demand that they tell
the truth is elemental, and that's due to the fact that when the
sick person is a head of state who was just re-elected for a new
term, there are implications that affect the entire nation,"
Aveledo said.  Chavez's allies have accused right-wing political
opponents of delibera