HOME >> BIOLOGY >> NEWS
The results are in: Bacterial parasite strives for balance in host infection

When horror-movie writers run out of ideas, they can always turn to parasites. Imagine the possibilities with flesh-eating bacteria, suicide-inducing hairworms, scalp burrowing botflies--and castrating parasites. Such debilitating effects are an inevitable consequence of infection, but it is in the parasite's interest to avoid killing the host until it can transmit a new crop of pathogens. In the "tradeoff hypothesis" for the evolution of virulence--how quickly a parasite kills its host--host exploitation and parasite reproduction are balanced to maximize the parasite's lifetime transmission success. But lifetime transmission success, an indicator of parasite fitness, has proven difficult to measure, leaving scant direct evidence for an optimal level of virulence. In a new study, Knut Helge Jensen, Dieter Ebert, and colleagues now provide empirical evidence that such a trade-off exists.

The authors worked with water fleas (Daphnia magna) and the castrating bacterium Pasteuria ramosa to investigate the relationship between parasite fitness and virulence. Castrating parasites divert resources from host reproduction toward their own reproductive ends. In the case of P. ramosa, that means generating transmission-stage parasites, or spores. In keeping with the tradeoff hypothesis, the researchers predicted that the parasite should castrate early to optimize the appropriation of host resources, and produce intermediate levels of virulence to keep the host alive long enough to maximize spore production. To determine the relationship between virulence and lifetime production of transmission-stage parasites, the researchers exposed a Daphnia clone to bacterial spores and tracked individual host mortality. Infected Daphnia sustained far more casualties than either unexposed controls or exposed but uninfected individuals, with deaths beginning at 23 days old and ending at 74 days old. (The first control died at 96 days old.) Early host death (high virulence) wa
'"/>

Contact: Natalie Bouaravong
press@plos.org
415-568-3445
Public Library of Science
29-May-2006


Page: 1 2

Related biology news :

1. Cooperative science program yields results
2. Delayed treatment of childhood-onset bipolar disorder results in negative outcome in adults
3. Smelling for first time results from knowing abnormalities in congenital loss of smell
4. BDSI announces positive phase III clinical trial results
5. Scientists meet to review Envisat results after 5 years of operations
6. Environment and exercise may affect research results, UA study shows
7. Preliminary results of largest scan of autism DNA information
8. Human trial results show excellent safety data, from Geovaxs DNA/MVA AIDS vaccines
9. Rodent sperm work together for better results
10. Dramatic results from combo therapy surprises Krabb-disease researchers
11. TIGER workshop highlights project results

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/6/2020)... (PRWEB) , ... February 06, 2020 , ... ... to facilitate access to unique lab-made bioresearch materials, today announced an agreement with ... and plant-based meat and seafood a reality. Under the partnership, terrestrial meat and ...
(Date:2/5/2020)... ... February 05, 2020 , ... LabKey has ... efficiency and insight to sample processing within laboratories. , Built with input ... research in various fields, LabKey Sample Manager has been designed with an intuitive ...
(Date:1/30/2020)... (PRWEB) , ... January 30, 2020 , ... Accelera ... an eye on the Canadian market, is pleased to announce that the company has ... growth since the company launched in 2017. , “We are so thrilled to ...
Breaking Biology News(10 mins):
(Date:2/5/2020)... ... February 05, 2020 , ... Rare Disease Day® ... by The National Organization for Rare Disorders (NORD), to raise awareness amongst the general ... ). The Balancing Act’s “Behind The Mystery” rare disease series will be ...
(Date:1/28/2020)... WASHINGTON (PRWEB) , ... January ... ... provider of enterprise software solutions for biopharmaceutical R&D, today announced the release ... release reinforces Genedata’s focus on supporting the implementation of Multi-Attribute Methods (MAM) ...
(Date:1/24/2020)... ... January 24, 2020 , ... The plastic and reconstructive ... Center in New Jersey epitomize the notion that plastic surgery is much more than ... in popular media. , Over the last 20 years NJ Top Docs, Dr. Andrew ...
(Date:1/22/2020)... Calif. (PRWEB) , ... January 20, 2020 , ... ... today announced a partnership with WAVE Electronics, the largest independent electronics distributor in ... partners to purchase Brilliant Smart Home Systems with leading smart home products from ...
Breaking Biology Technology:
Cached News: