Addressing a news briefing in Dushanbe, Rahmatullo Zoirov said tests he recently received in Switzerland and Russia testify to the presence of unspecified toxins in his blood and urine.
Zoirov provided no further details, saying only that he does not know who may have wanted to poison him.
The HSDT leader returned last week to Tajikistan after spending about a month abroad, officially to undergo medical checkups.
Zoirov is widely expected to be nominated as a candidate for the November presidential election when his party holds its congress on September 17.
Tajik political analysts believe Zoirov could pose a serious challenge to President Imomali Rahkmonov if the latter decides to run for a third term.
EAST OF THE WEST: On June 29, RFE/RL's Prague broadcasting center hosted a presentation by GULNARA ABIKEYEVA, director of the Central Asian Cinematography Center in Almaty, Kazakhstan. Abikeyeva is a leading expert on Kazakh and Central Asian cinema, a chairwoman of the jury of this year's East Of The West section of the Karlovy Vary film festival. Abikaeyeva gave an overview of major trends in Central Asian cinema since the 1960s. Abikeyeva has just completed a major DVD collection of the most popular films of the five Central Asian countries and is now beginning work on a similar collection of Central Asian documentaries.
LISTENListen to the complete presentation (45 minutes):
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