1 Haemophilia A is a recessive X-linked genetic disorder involving a lack of functional clotting Factor VIII and represents 80% of haemophilia cases. 2  Haemophilia B is a recessive X-linked genetic disorder involving a lack of functional clotting Factor IX.
There are other biochemical tests that help to identify Serratia marcescens in the lab. It is negative for the methyl red test due to their production of 2, 3 - butanediol and ethanol, but positive for the Voges-Proskauer test, which shows an organismâs ability to convert pyruvate to acetoin [4].ydrolysis of casein is not a common trait and is therefore useful in the differentiation of Serratia marcescens from the 438 strains of Enterobacteriaceae and Pseudomonadaceae families [12]. Serratia marcescens has the reproducible capability to break down casein producing a clearing on milk agar plates.
Bartholomeo Bizio, a pharmacist from Padua, Italy, discovered and named S. marcescens as a microbial cause for the âmiraculousâ bloody discoloration in a cornmeal mush called polenta. He looked at the red spots under a microscope and saw what he described as a fungus.