Questions tagged [parasitology]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
34 views

What are the environmental conditions for larval Haemonchus contortus to survive?

What is known about the environmental limits for Haemonchus contortus to survive outside of a host organism in its larval stages? I'm interested in knowing: temperature tolerance levels preferred ...
-2
votes
1answer
41 views

Can birds pass diseases to humans through contact surfaces?

My friend asked me the following question. She has a pigeon nesting on her window and the pigeon often touches the window, and my friend also sometimes touches the window (e.g. open and close it). The ...
0
votes
1answer
82 views

My dog and I are wondering: is this a biting midge, or another bug?

A week or two ago, my dog started scratching, and it only increased. Not long after, I started getting bit by something that itches something awful. I thought it was fleas so got some medication and ...
0
votes
0answers
14 views

What is the lifespan of haemonchus contortus in its L5 adult form?

Once haemonchus contortus reaches L5 in the abomasum, absent external factors (such as treatment of the infected animal with an anthelmintic), how long can it live there?
11
votes
2answers
4k views

How does the immune system fight scabies mites?

After a distressing episode involving my elderly mother and a nursing home, I've been reading up on scabies. It seems that in healthy people, the immune system limits the mite population to around 10 ...
-1
votes
1answer
75 views

What's this parasite?

Any microbiologists or parasitologists recognize this? It's from my pet bearded dragon in the eastern US and the vet's never seen it before.
0
votes
0answers
17 views

How would evolution explain parastitic wasps? [duplicate]

I read this article about wasps that can do "brain surgery" on cockroaches. https://www.wired.com/2014/02/absurd-creature-of-the-week-jewel-wasp/ How does evolution create such a thing? The brain ...
26
votes
1answer
3k views

Why is untreated trypanosomiasis invariably fatal in humans?

If left untreated, African trypanosomiasis will invariably kill the patient. The human immune system is unable to clear the infection. I am aware of a few other infectious diseases with this property ...
1
vote
0answers
24 views

Are there other examples besides wasps' polydnaviruses in which a parasitic species introduces an immunosuppressant virus in the parasite's host?

An interesting form of mutualism: Parasitoid wasps serve as hosts for the virus, and Lepidoptera serve as hosts for these wasps. The female wasp injects one or more eggs into its host along with a ...
-1
votes
1answer
57 views

Why are bats so resistant to getting disease from viruses? [duplicate]

I saw in the YouTube video COVID-19 that bats carry so many viruses, yet never or almost never get a disease by any of them. I'm looking for an evolutionary reason as well as a reason based on how ...
0
votes
1answer
35 views

A plant in my aquarium seems to be growing small plants under its leaves, what's going on?

In my aquarium I have this plant. I think it's a kind of swordplant. I've loosely attached it to a large piece of driftwood in the hope that it will grow itself on there, I saw that they had done the ...
3
votes
0answers
36 views

Long-term viability of induced parthenogenesis

Short version: Some parasitic bacteria, such as Wolbachia, cause hosts from sexually-reproducing insect species to reproduce asexually instead, with an all-female line. Sometimes, all members of the ...
4
votes
1answer
98 views

The emergence of Phengaris butterflies from ant nests

The butterflies of the Phengaris genus (also known as Maculinea) are known to be brood parasitic. During the fourth instar, the caterpillars leave their food plant and mimic ant larvae, causing the ...
6
votes
1answer
349 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 ...
11
votes
3answers
324 views

Is it possible for a parasitic wasp to alter the behaviour of its host after emerging from it?

I know that parasitic wasp larvae can live for a long time inside their live host (eg. caterpillar), but I always thought that they kill the host when they eventually get out of it. But I've seen a ...
4
votes
1answer
134 views

How do parasites “reprogram” brains?

Dicrocoelium dendriticum is a parasite that uses ants as a second intermediate host (which means that ants aren't its primary host/target, but are rather a temporary host to help reach their main/...
5
votes
1answer
53 views

How do schistosomes find and attach to human skin?

Schistosomes are parasitic flatworms that have a snail intermediate host and a human definitive host. After developing in the snail, they (cercariae stage) escape into the water and can attach to the ...
4
votes
1answer
194 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?
1
vote
0answers
20 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 ...
6
votes
3answers
156 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 ...
35
votes
3answers
14k views

Why do parasites sometimes kill their hosts?

It's bothered me for a while now. I understand why a parasitoid would do this, as it only temporarily requires the host, and that not all parasites kill their hosts. There seems to be no evolutionary ...
4
votes
1answer
132 views

Blood consumption

Is consumption of blood more "dangerous" compared to meat? There was a news-article about unnatural chemicals found in the blood of mothers. This reminded me about a question I have pondered upon ...
2
votes
0answers
13 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
votes
0answers
29 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 ...
4
votes
1answer
8k views

Can a reservoir host act as a vector?

Is it possible to get an infection by contact with a reservoir host ? Can a reservoir host act as a vector ? What is the distinction between these two concepts (reservoir host vs vector) ?
4
votes
1answer
431 views

What is meant by bionomics of a vector?

What is supposed to fall under the title Bionomics (The study of an organism and its relation to its environment; ecology.)? Suppose we are dealing with a vector, Anopheles sp. are the following ...
1
vote
0answers
3k 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.) ...
22
votes
2answers
3k views

Are some people more 'attractive' to mosquitos? If so, is that a hereditary trait?

Mosquitos clearly love me-- but I have been told I am just more reactive to mosquito bites. Are some people more 'attractive' to mosquitos (get bit more)? Or is it just that they are more reactive? If ...
3
votes
1answer
384 views

can one be infected with Naegleria fowleri by taking Steam?

will Naegleria fowleri be present in the steam molecules. Many people take steam from hot water to get relief from sinus. I read somewhere that Naegleria fowleri gets killed over 70 C. So steam will ...
13
votes
1answer
570 views

Two different Leucochloridium infected snails - different species?

In the last three days, I have found two snails infected by some species of Leucochloridium. I found them in my garden in the south-west of Sweden. Now I'm wondering if they are the same species or ...
6
votes
1answer
863 views

How much influence does toxoplasmosis have on personality and intelligence?

Latent toxoplasmosis affects up to 1/3 of the human population and up to 40% of the population in Australia. I have heard that latent toxoplasmosis has many significant undesirable effects on ...
2
votes
1answer
101 views

Can toilet or sewage aerosol transfer eggs of human parasites?

Flushing a toilet produces hundreds of thousands of tiny droplets containing viruses and bacteria (source): Up to 145,000 droplets were produced per flush, with the high-energy flushometer ...
6
votes
0answers
141 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 ...
1
vote
1answer
146 views

Why are there no endoparasitic mammals or reptiles or birds? [closed]

I am curious why there aren’t any endoparasitic mammals, reptiles or birds Endoparasite being a parasite that live In the host whereas ectoparasite lives On the host I hope this clears up confusion
6
votes
2answers
389 views

How can a tongue-biting parasitic arthropod become a fully functional tongue?

From wikipedia: The parasite Cymothoa exigua [consumes a fish's tongue and] then replaces [it] by attaching its own body to the muscles of the tongue stub. The fish is able to use the parasite just ...
1
vote
1answer
37 views

Do Pthirus gorillae remain in gorilla leaf nests after gorillas migrate and abandon them?

Gorillas build leaf nests to sleep in. Do the lice which parasitise gorillas, Pthirus gorilla, remain in gorilla leaf nests after gorillas migrate to new regions (and abandon the old nests)?
5
votes
1answer
13k views

What is the difference between Reservoir and paratenic hosts?

Paratenic host 'In parasitology, the term paratenic describes a host that is not necessary for the development of a particular species of parasite, but nonetheless may happen to serve to maintain the ...
1
vote
2answers
2k views

Does malaria have a reservoir host?

Can warm blooded vertebrates other than humans act as reservoir hosts for malaria parasites? I'm mainly interested in Plasmodium vivax and possible reservoir hosts in the wider area of Europe/ Eurasia....
1
vote
0answers
58 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 ...
0
votes
0answers
24 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 ...
1
vote
0answers
58 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 ...
2
votes
1answer
405 views

Why don't mosquitoes target the visible blood vessels under the skin?

We can see numerous veins under our skin. Why don't mosquitoes suck blood from those vessels? Why don't they use better option?
2
votes
0answers
16 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 ...
7
votes
1answer
731 views

Worm found inside of wahoo

A fisherman from Hawaii wrote the following: This Fat juicy worm lives inside of every Wahoo that I catch. Inside the stomach. Right at the junction to the intestines. Sometimes there are two. ...
0
votes
1answer
28 views

RNA seq: Should non-infected units be used for RNA-seq?

I am designing a RNA-seq experiment to study transcriptomic profile changes upon parasite exposure. Some papers I read, mostly extract RNA from the entire treatment group (organisms exposed to ...
1
vote
1answer
66 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 (...
3
votes
1answer
190 views

Laurus Nobilis parasite identification

In north Italy were I live I have two plants of laurus at the two sides of a garden. One of them has some sort of parasite on its leaves. Someone know something about it? Leaves are covered with ...
4
votes
2answers
9k views

Why is the mosquito a definitive host in malaria?

I thought that the definition of a definitive host was that the parasite had to sexually reproduce in that particular host. I've been told that mosquitoes are the definitive host for the plasmodium ...
2
votes
1answer
56 views

Save endangered parasitic species?

It seems to be an important issue the parasitic control and even some pursue the eradication of some species. Most of the researchers in parasitology are focused on the host damage and population ...
0
votes
1answer
114 views

How did parasitoid wasps evolve their life cycle?

I know there are a variety of wasps with various strategies for acquiring and controlling hosts. Do these form a rough picture of how these life cycles could have developed in the first place? What is ...