Lab Quiz 3 Flashcards
Sickle cell or hemoglobin S
Hemoglobin C
Rectangular hemoglobin crystals
Hemoglobin SC
Irregular crystals, sickle cells, target cells
Hemoglobin E
MCV = 58; Hb = 13.5
Non-specific target cells
Neonate “kiddie” lymphs
Small naive lymphocytes
Normal lymphocytes
Reactive lymphocyte
Atypical lymphocyte
Reactive lymphocyte
Monocyte
Anaplasma phagocytophilum
Rodents natural hosts
Fever, severe headache, muscle pain, malaise
<1% fatal
Morula in neutrophils
Ehrlichia chaffeensis
Deer natural hosts
Fever and chills, severe headache, muscle pain, rash
3% fatal
Morula in monocytes
Bacteria
Bacilli, cocci, spirochete
Bacteria stain blue-purple with romanowsky stains
Rarely present in high enough numbers to be seen on peripheral blood smears
Fungi
Yeast: candida, cryptococcus, malassezia furfur
Dimorphic fungi: histoplasma capsulatum, penicillium marneffei
Candida albicans
Normal flora
Common cause of health-care associated sepsis
40-60% fatality
Causes respiratory infections and thrush
Histoplasma capsulatum
Biphasic mold
Environmental in nitrogen rich soil
Infection is problematic for immuno-compromised persons
Indicator of aids
Babesia microti
Babesia
Pyriform shapes
Teardrop pairs
Babesia
May form tetras or “Maltese crosses”
Not seen in malaria
Babesia
Cases with very high parasitemias may occur as extracellular aggregates
Can be confused with schizonts of plasmodia
A classical malaria attack lasts how long and consists of what?
6-10 hours
Consists of:
A cold stage (shivering)
A hot stage (fever, headaches, vomiting; seizures in young children)
A sweating stage (sweats, normal temp., tiredness)
What are 3 severe forms of malaria
Black water fever
Cerebral malaria
Severe anemia
What is the stain of choice for malaria parasites
Giemsa stain
What is an alternative to Giemsa stain
Wright stain
What does not show with a wright stain?
Schuffner’s dots
What kind of ph shows Schuffner’s dots better
Basic
Malaria P. vivax with wright stain
No Schuffner’s dots