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The victims, already seriously ill, were stricken with Serratia marcescens bacteraemia in February and March.

Drugs of different types and strengths were found in the same bottle; Avandamet was shipped in tablets of the wrong strength; and Bactroban was "contaminated with a micro-organism associated with bacteraemia, urinary tract infections, meningitis, wound infection, and peritonitis", court documents show.

They were looking for genetic variants that might increase susceptibility to TB, malaria and serious bacterial infections of the blood, or bacteraemia.