Agar types Flashcards
What does a positive coagulase test look like?
Golden coloured colonies
What does a negative coagulase test look like?
Silver/white coloured colonies
What does the MacConkey agar test
Whether the organism is lactose fermenting or not
What does the CLED agar test
Whether the organism is lactose fermenting or not
What does the XLD agar test
Whether the organism is lactose fermenting or not
Name 5 sterile sites of the body
Blood CSF Pleural fluid Peritoneal cavity Joints Urinary tract Lower respiratory tract
Name 4 sites of the body that are colonised with bacteria
Skin Large intestine Mouth Vagina Urethra
What is chocolate agar?
Blood agar that has been heated to 80o to release nutrients
What does a negative MacConkey test look like and what does this mean?
White/colourless colonies showing non-lactose fermenting
What does a positive MacConkey test look like and what does this mean?
Red colonies showing lactose fermenting
Why is PCR and other NAATs used to test for viruses?
As viruses cannot be seen or grown easily
What does NAAT stand for?
Nucleic acid amplification test
Name 5 important viral infections
Herpes Enteroviruses (e.g. rhinovirus) Hepatitides (A, B, C, Delta, E) Influenza Measles Mumps Rubella Rotavirus/norovirus HIV
HIV tests can look for any of 3 markers in the blood - what are these?
Antibody
Antigen p24
HIV RNA
If an XLD plate shows red colonies WITH black centres what organism is likely to be present?
Salmonella
