: an organism living in, with, or on another organism in order to obtain nutrients, grow, or multiply often in a state that directly or indirectly harms the host (see host sense 1) The blood schizogonic cycle of human malaria parasites has thus far been the most exhaustively studied phase of parasite development. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'parasite.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2021 The image shows a fish with its mouth being held open, showing a grotesque parasite. Theresa Machemer, Smithsonian Magazine, 27 Apr. 2021 Cyclospora is a parasite that can cause the intestinal infection Cyclosporiasis.īrett Molina, USA TODAY, 29 June 2021 Unlike comparatively simple viruses and bacteria, malaria is a parasite with many stages to its life cycle and thousands of genes. 2021 Another one is the complexity of the malaria parasite, which has around 5,000 genes that a vaccine could target.ĭenise Roland, WSJ, 6 Oct. 2021 The vaccine is the first of its kind against a human parasite-which have proven far harder to vaccinate against than bacteria or viruses. Babesia microti is a parasite that, like malaria, invades red blood cells to reproduce. 2021 And while babesia has never been reported in Colorado and only once in the past five years in Montana, it had certainly been seen in other states across the U.S. 2021 Malaria is a complicated parasite that has evolved alongside humans for thousands of years. Recent Examples on the Web Viruses are four times more likely to emerge in human populations than the average parasite (a relative risk of 400%) whereas helminths (parasitic worms) are only one fourth as likely to cause novel diseases in humans (a relative risk of only 24%). Weiss Salmonella species are intracellular parasites, and it is thought that these bacteria gain access to their host by penetrating through intestinal epithelial cells. Fisher Like all viruses, the human immunodeficiency virus ( HIV) is an intracellular parasite: the virus particle itself is inert and cannot propagate or do any damage until it enters a host cell. Unlike bacteria or viruses, parasites undergo a metamorphosis during their life cycles that presents the human immune system with a moving target. Some restrict the use of parasite to include only multicellular forms (such as protozoans and helminths) while others use it to include bacteria and viruses. The cowbird lays its much-larger eggs in the vireo's nest, which hatch first and place such a high food demand on its tiny "parents" that the vireo young go unfed. Sadly, the vireo is vulnerable to a nest parasite, the brown-headed cowbird …. Lucas The blood schizogonic cycle of human malaria parasites has thus far been the most exhaustively studied phase of parasite development. David Jones The fungus is an obligate parasite, that is, it must have a living host (tobacco) on which to grow and complete its life cycle. To some (like the tapeworm) it is fatal but smarter ones (like the louse) simply go off in search of a new host.
Ivermectin is a Food and Drug Administration (FDA)-approved antiparasitic drug that is used to treat several neglected tropical diseases, including onchocerciasis, helminthiases, and scabies.1 It is also being evaluated for its potential to reduce the rate of malaria transmission by killing mosquitoes that feed on treated humans and livestock.2 For these indications, ivermectin has been widely used and is generally well tolerated.1,3 Ivermectin is not approved by the FDA for the treatment of any viral infection.1 : an organism living in, on, or with another organism in order to obtain nutrients, grow, or multiply often in a state that directly or indirectly harms the host (see host entry 3 sense 2a) Now the death of its host is certainly a setback to any parasite. These are the 12th and 13th COVID fraud related domain name seized by the Maryland U.S. Individuals visiting the sites will now see a message that the site has been seized by the federal government and be redirected to another site for additional information. Instead, the domains were allegedly used to collect the personal information of individuals visiting the sites in order to use the information for nefarious purposes, including fraud, phishing attacks, and/or deployment of malware. The fraudulent websites allegedly offers for sale a number of drugs for the experimental and unapproved treatment or prevention of COVID-19.