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.
Once considered a harmless saprophyte, Serratia marcescens is now recognized as an important opportunistic pathogen combining a propensity for healthcare-associated infection and antimicrobial resistance. Serratia marcescens is a member of the genus Serratia, which is a part of the family Enterobacteriaceae. Currently 14 species ofSerratia are recognized within the genus, eight of which are associated with human infection (67).