Questions tagged [parasitology]

The study of parasites, their hosts, and the relationship between them.

7
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3answers
111 views

Why do so many parasites infect definitive and intermediate hosts rather than just one host?

Many parasites infect multiple host species, with one host species being the definitive host (where the parasite reproduces), and the other host species being the intermediate host (where the parasite ...
1
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1answer
65 views

Validation of houskeeping genes in a mixture of cDNAs of two species

I have a parasite sample (mixed with host blood) and I need to check gene expressions of parasite using relative quantification (RT_qPCR). For this, I need a good housekeeping gene. I chose 10 genes (...
6
votes
0answers
112 views

Found in blood sample - what is it? Hopefully not a nemotode-

After examining someone's blood - through microscope - I found these. There were some more that were not photographed. Could someone please inform me on what these are? Maybe abiotic material on the ...
4
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0answers
102 views

Are there any plants that parasitize on animals?

It seems, fungi often infect animals, while plants it seems, never. Is it because the cellulose cell walls make them incompatible with animal tissue?
4
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0answers
129 views

Are there any parasites that alter human behavior in a self destructive way?

There seems to be quite a few examples of parasites taking over the behavior of insects in a way that leads to the death of the host. A couple of examples include: Spinochordodes tellinii: A ...
4
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0answers
92 views

How to calculate the number of sterile insects that must be released in SIT?

The sterile insect technique (SIT) is used to control insect pests through overwhelming the population in sterile males. The increase in sterile males released into an environment causes the increase ...
2
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0answers
8 views

How to isolate a high proportion of available helminth ova from animal faeces/feces without damaging them?

I need to isolate large numbers (tens to hundreds of thousands) of cat (and later dog) hookworm ova from cat/dog faeces. I have a centrifuge, and various sieves with pore sizes of 20, 63, 75, 106, ...
2
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0answers
25 views

What does it mean for Caenorhabditis species to be “pseudoparasitic”?

In this Wormbook chapter, Kiontke says that some Caenorhabditis species live "pseudoparasitically" on warm-blooded animals. What does it mean? What is a pseudoparasite? I understand a parasite to be ...
2
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0answers
15 views

Mackerel evolutionary health affected by loss of predators?

I notice that Atlantic Mackerel (Scombrus scombrus) is endemically affected by parasites. In one study I read that the researchers found that over 70% of the mackerel sampled were infected with ...
2
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0answers
29 views

What is the estimated number of variant surface glycoproteins that trypansomes can express?

In "Vaccination against trypanosomiasis" by Greca and Magez they assert that there are "innumerable" variant surface glycoproteins that the parasite can express. What does innumerable mean here? These ...
2
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0answers
815 views

Parasites with both plant and animal hosts?

Are there animals (or plants) that are parasitic on both animals and plants? Especially such that they rely on their plant host being eaten by their animal host?
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0answers
11 views

Viability of Toxoplasmosis oocysts on dry smooth surfaces

This is a weird question. My wife is terrified of contracting toxoplasmosis during pregnancy and I was hoping I could get an expert opinion here to potentially make her feel better. She recently ...
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0answers
610 views

Why some eggs are bile stained?

Why eggs of some helminths( Diphyllobothrium latum, Trichuris trichiura, Ascaris lumbricoides etc) are stained with bile while eggs of other helminths( Hymenolepis nana, Enterobius vermicularis etc.) ...
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0answers
55 views

Exclusion Limit and permeability of outer membrane

According to this textbook: P aeruginosa, for example, which is extremely resistant to antibacterial agents, the outer membrane is 100 times less permeable than that of E coli.[pg.no 27] and then ...
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0answers
50 views

Sub-saharan africans (Andamanese, Semang) have the ancestral hair-type, do they also have pediculus humanus capitis lice?

Do humans with the ancestral hair-type also have pediculus humanus capitis lice? Pubic hair lice, Pthirus pubis, are adapted morphologically to cling onto coarse body hair, and originates from ...
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0answers
1k views

What decides the nocturnal periodicity of microfilariae?

Microfilariae, which are the larvae of filarial worms show a nocturnal periodicity of entering into blood in south Asia and China. This coincides with the biting habits of its vector. The same very ...
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0answers
257 views

Why does histamine release in Type I hypersensitivity help in case of parasites?

The IgE system exists because the same events which lead to often-life threatening complications of allergy, in presence of parasites are helpful in their elimination. The tissue injury mediated ...
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0answers
75 views

Question about *Cryptosporidium hominis*

Cryptosporidium muris infects mostly rodents and it is usually found in gastric gladns. Cryptosporidium parvum infects humans and certain animals and it is found in the terminal ileum and colon. ...
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0answers
53 views

Encephalitozoon cuniculi

Can anyone advise me a literature supporting the claim that Encephalitozoon cuniculi is an aerobic organism? I have seen papers saying otherwise, but also I was told that this is not quite true.
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0answers
8 views

Life cycle of Ascaris worms

Why do Ascaris larva move to the epiglottis from the lungs only to come down with food to the small intestine and become an adult?
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0answers
9 views

Are deer ticks primarily active in bedding areas?

I know that with fleas, they tend to lay their eggs on the host and the eggs fall off into bedding areas, so the bedding areas are sort of the epicenter of a flea infestation. Is it the same with ...
0
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0answers
20 views

Could there be latent infections in the human population that we don't know of?

Herpes simplex 1 virus and toxoplasmosis are common infections that that many of use have (65% and 10% of americans, respectively). Both of these are chronic, latent infections that can occasionally ...