BUZZ-Valeant's dim forecast infects specialty pharma stocks
** Shares of specialty pharmaceutical cos get clipped after beleaguered Valeant Pharmaceuticals slashes its 2016 forecast
** U.S.-listed Valeant shares now down 40 pct to more than 4-year low
** Mallinckrodt and Endo International fall in sympathy and among biggest S&P 500 index losers, both down nearly 7 pct; Horizon Pharma PLC drops 9 pct
** Trader says Valeant's woes should be less of a fundamental read across to Mylan NV and Teva Pharmaceutical Industries ; MYL down 3 pct, U.S.-listed TEVA shares off 4 pct
** Specialty pharma stocks have been hurt by questions facing Valeant over pricing and other business practices
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