A child is believed to have a Toxocara cati infection in his eye, which he acquired after playing with a stray cat for several weeks. A serum titer was performed, which revealed a titer of 1:8 . This laboratory value can be interpreted as:
a. normal.
b. insignificant.
c. diagnostic.
d. negative.
C
Serologic diagnosis has proven effective, particularly in ocular larval migrans (OLM). Aqueous humor elevated antibody titer specific for Toxocara spp., in comparison to serum levels, is con-sidered diagnostic. Although serologic analysis can be useful, it is important to note that antibo-dy titers may vary, depending on the location of the infection. A serum titer of 1:8 is considered significant for OLM; 1:32 is significant for visceral (tissue) larval migrans (VLM).
You might also like to view...
What is different about the way that NADH and FADH2 donate electrons to the electron transport chain?
A. NADH is oxidized and FADH2 is reduced. B. More protons are transported into the intermembrane space of the mitochondria in response to one molecule of FADH2 as compared to the number of protons transported in response to one molecule of NADH. C. NADH contributes its electrons to the first transmembrane complex in the electron transport chain and FADH2 contributes its electrons after the first transmembrane complex. D. The electrons from NADH ultimately go on to reduce oxygen to generate water, whereas the electrons from FADH2 are used to reduce pyruvate to lactate.
What methods do animals use to communicate with one another?
What will be an ideal response?
In Escherichia coli, when the lac operon is fully induced (in the presence of lactose):
A. lactose cannot be cleaved to enter glycolysis. B. the lac repressor is active and transcription of the lac operon does not occur. C. lactose cannot be transported by the cells. D. the lac repressor is inactive and transcription of the lac operon does occur.
Plants such as peppermint and sage contain oils. What is the function of these oils?
A. They help keep the plant from drying out. B. They keep other plants from germinating nearby. C. They help repel insects. D. They have hormone-like activity that helps wounds heal. E. They prevent fungal infection.