Infection dynamics of a sexually transmitted nematode (Mehdinema alii) in the decorated cricket (Gryllodes sigillatus)

2002 ◽  
Vol 80 (7) ◽  
pp. 1145-1148 ◽  
Author(s):  
Lien T Luong ◽  
Harry K Kaya
Keyword(s):  
Mechanical Transmission ◽  
Post Inoculation ◽  
Sexually Transmitted ◽  
Infection Dynamics ◽  
Female Cricket ◽  
Gryllodes Sigillatus ◽  
Decorated Cricket ◽  
Nematode Transmission ◽  
Nematode Development

We investigated the transmission dynamics of a sexually transmitted nematode, Mehdinema alii, in the decorated cricket, Gryllodes sigillatus. Adult crickets were experimentally inoculated with infective stages of the nematode, called dauerlarvae, to determine the role of the female cricket in nematode transmission. We found that female crickets serve only as a means of mechanical transmission, so nematodes do not require passage through a female cricket to be infective. Dauerlarvae were experimentally placed on the genitalia of both sexes. In the male, the dauerlarvae migrated into the gut and proceeded to develop into adult nematodes, whereas those that were inoculated into the female genitalia failed to migrate into the gut. When dauerlarvae were inoculated directly into the female rectum, the nematodes failed to develop. Therefore, the female gut is not a suitable environment for nematode development. Dauerlarvae persisted in the female cricket for up to 12 days post inoculation and remained infective to male crickets.

scholarly journals Determinants of Eimeria and Campylobacter infection dynamics in UK domestic sheep: the role of co-infection

Parasitology ◽  
2021 ◽  
Vol 148 (5) ◽  
pp. 623-629
Author(s):  
Raed Taha Al-Neama ◽  
Kevin J. Bown ◽  
Damer P. Blake ◽  
Richard J. Birtles
Keyword(s):  
Domestic Sheep ◽  
Infection Dynamics ◽  
Campylobacter Infection

Abstract

scholarly journals Intranasal Infection of Ferrets with SARS-CoV-2 as a Model for Asymptomatic Human Infection

Viruses ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 113
Author(s):  
Helen E. Everett ◽  
Fabian Z. X. Lean ◽  
Alexander M. P. Byrne ◽  
Pauline M. van Diemen ◽  
Shelley Rhodes ◽  
...  
Keyword(s):  
Genomic Sequence ◽  
Humoral Response ◽  
Asymptomatic Infection ◽  
Human Infection ◽  
Viral Rna ◽  
Post Inoculation ◽  
Upper Respiratory Tract ◽  
Infection Dynamics ◽  
Genomic Sequence Analysis ◽  
Upper Respiratory

Ferrets were experimentally inoculated with SARS-CoV-2 (severe acute respiratory syndrome (SARS)-related coronavirus 2) to assess infection dynamics and host response. During the resulting subclinical infection, viral RNA was monitored between 2 and 21 days post-inoculation (dpi), and reached a peak in the upper respiratory cavity between 4 and 6 dpi. Viral genomic sequence analysis in samples from three animals identified the Y453F nucleotide substitution relative to the inoculum. Viral RNA was also detected in environmental samples, specifically in swabs of ferret fur. Microscopy analysis revealed viral protein and RNA in upper respiratory tract tissues, notably in cells of the respiratory and olfactory mucosae of the nasal turbinates, including olfactory neuronal cells. Antibody responses to the spike and nucleoprotein were detected from 21 dpi, but virus-neutralizing activity was low. A second intranasal inoculation (re-exposure) of two ferrets after a 17-day interval did not produce re-initiation of viral RNA shedding, but did amplify the humoral response in one animal. Therefore, ferrets can be experimentally infected with SARS-CoV-2 to model human asymptomatic infection.

scholarly journals Chlamydia trachomatis and urogenital mycoplasms in nonconococcal urethirits in men

2010 ◽  
Vol 63 (1-2) ◽  
pp. 47-50
Author(s):  
Sonja Vesic ◽  
Jelica Vukicevic ◽  
Eleonora Gvozdenovic ◽  
Dusan Skiljevic ◽  
Slobodanka Janosevic ◽  
...  
Keyword(s):  
Chlamydia Trachomatis ◽  
Ureaplasma Urealyticum ◽  
Mycoplasma Hominis ◽  
Sexually Active ◽  
Transmitted Infection ◽  
Sexually Transmitted ◽  
Nongonococcal Urethritis ◽  
Etiological Agents ◽  
The One

Introduction. Nongonococcal urethritis is the most common sexually transmitted infection in men, with vast majority of the etiological agents such as Chlamydia trachomatis, followed by urogenital mycoplasmas. The aim of this study was to determine the prevalence of Chlamydia trachomatis, Ureaplasma urealyticum and Mycoplasma hominis in nongonococcal urethritis in men, and to examine infections associated with these agents. Material and methods. 299 sexually active, heterosexual men with nongonococcal urethritis were included into the study. Urethral samples were taken with a dacron swab placed into the urethra up to 2-3 cm. The Direct immunojluorescence tehnique was performed for identification of Chlamydia trachomatis. Ureaplasma urealyticum and Mycoplasma hominis were detected with Mycoplasma 1ST assay. Results. Chlamydia trachomatis was detected in 22.75%, Uraeplasma urealyticum in 21.08% and Mycoplasma hominis in 8.02% cases. We found no significant differences in prevalence between Chlamydia trachomatis and Ureaplasma urealyticym (p>0.05). Monoinjections were found in 51.85% with significantly higher rate (p<0.01) than associated infections (11.70%). Among associated infections, coinfection of Chlamydia trahomatis and Ureaplasma urealyticum was predominant. Association of Chlamydia trachomatis with urogenital mycoplasmas was significantly higher (p<0.05) than the one between Ureaplasma urealyticum and Mycoplasma hominis. In 36.45% patients no patogenic microorganisms were detected. Conclusion. These results confirmed the etiological role of Chlamydia trachomatis and urogenital mycoplasmas in nongonococcal urethritis with prevalence of 51.85% in monoinfections and 11.70% in associated infections. In 36.45% of cases the etiology of urethritis was not elucidated. These results suggest that more sensitive diagnostic tool should be applied when searching for the detailed etiology of nongonococcal urethritis.

Genital mycoplasmas, including Mycoplasma genitalium, as sexually transmitted agents

2002 ◽  
Vol 13 (2) ◽  
pp. 79-85 ◽  
Author(s):  
Anneli Uusküla ◽  
Peter K Kohl
Keyword(s):  
Genital Tract ◽  
Ureaplasma Urealyticum ◽  
Female Genital Tract ◽  
Mycoplasma Species ◽  
Case Control Studies ◽  
Pathogenic Potential ◽  
Intracellular Location ◽  
Main Site ◽  
Sexually Transmitted

Mycoplasmas are the smallest free-living organisms, widespread in nature. Several mycoplasma species have been isolated from humans. For 6 of them: Mycoplasma hominis, Ureaplasma urealyticum, M. primatum, M. genitalium, M. spermatophilum and M. penetrans, the genital tract is the main site of colonization. This review is concentrated on the role of mycoplasmas as sexually transmitted agents, with the emphasis to M. genitalium infections. M. hominis and U. urealyticum are isolated from the genital tract of healthy men and women with considerable frequency. The biological features (attachment properties, possible intracellular location) and experimental inoculation studies of M. genitalium indicate that this mycoplasma has pathogenic potential. Data from case-control studies, looking at men with non-gonococcal urethritis and women with cervicitis, have revealed that M. genitalium behave similarly to Chlamydia trachomatis and have revealed that carriage of M. genitalium and C. trachomatis is usually independent of one another. M. genitalium could be considered as a potential cause of sexually transmitted urethritis in men, including men with persistent or recurrent urethritis. More studies are expected to ascertain the role of M. genitalium in the female genital tract. Evidence-based data are needed to decide whether current non-gonococcal infection treatment principles are applicable or not for M. genitalium infections.

Using The Health Belief Model to Explore Female's Perceptions of Male HPV Vaccination

2020 ◽  
Vol 30 (4) ◽  
Author(s):  
Rebecca Vidourek ◽  
Keith King ◽  
Brittany Rosen ◽  
Sara Fehr
Keyword(s):  
Hpv Vaccination ◽  
Health Belief ◽  
Transmitted Infection ◽  
Papilloma Virus ◽  
Sexually Transmitted ◽  
Vaccination Rates ◽  
Midwestern University ◽  
Belief Model ◽  
The Health Belief Model

Background: Human Papilloma Virus (HPV) is a common sexually transmitted infection. The HPV vaccination is an effective method of preventing cervical cancer and genital warts. The present study examined females’ perceptions of male HPV vaccination. Methods: Participants were females (N = 306) from one Midwestern university. Results: Results indicated significant differences in perceived benefits to male HPV vaccination students’ based on grade and knowing a male/female that had the vaccine. No significant differences in perceived barriers were found in the study. Conclusions: These findings should be considered when developing programs aimed at educating students on the male HPV vaccine. The role of females in increasing male HPV vaccination rates should be considered.

scholarly journals Chlamydia trachomatis infection: a challenge for the urologist

2011 ◽  
Vol 2 (1) ◽  
pp. 14 ◽  
Author(s):  
Tommaso Cai ◽  
Sandra Mazzoli ◽  
Nicola Mondaini ◽  
Gianni Malossini ◽  
Riccardo Bartoletti
Keyword(s):  
Chlamydia Trachomatis ◽  
Bacterial Infections ◽  
Reproductive Tract ◽  
Diagnosis And Treatment ◽  
Everyday Clinical Practice ◽  
Chlamydia Trachomatis Infection ◽  
Sexually Transmitted ◽  
New Findings ◽  
Asymptomatic Infections

<p>The role of <em>Chlamydia trachomatis</em> (Ct) in everyday clinical practice is now on the increase because Ct infections are the most prevalent sexually transmitted bacterial infections worldwide. Ct can cause urethritis, cervicitis, pharyngitis, or epididymitis, although asymptomatic infections are quite common. Ct infection remains asymptomatic in approximately 50% of infected men and 70% of infected women, with risk for reproductive tract sequelae both in women and men. A proper early diagnosis and treatment is essential in order to prevent persistent consequences. An accurate comprehension of the pathology, diagnosis and treatment of this entity is essential for the urologist. We review the literature about the new findings in diagnosis and treatment of Ct infection in sexually active young men.</p>

scholarly journals Conceptions of sexuality of adolescents living in residence cares: are their interests and curiosities different?

2021 ◽  
Vol 2 (2) ◽  
pp. 449-458
Author(s):  
Zélia Caçador Anastácio
Keyword(s):  
Children And Adolescents ◽  
Sexuality Education ◽  
Research Question ◽  
Main Role ◽  
Quantitative Methodology ◽  
Sources Of Information ◽  
Equal Rights ◽  
Convenience Sample ◽  
Sexually Transmitted

The institutionalization of children and adolescents generally is due to unfavourable socio-economic conditions, children maltreatment, school absenteeism and adolescents’ behavioural problems, including sexual risk behaviours. Sexuality education (SE) is very difficult to approach in residence care, given the sensitive and problematic life stories of adolescents involved. It is important to know what adolescents already know and what they want to learn and clarify about sexuality. The research question was: What interests and curiosities of sexuality do adolescents living in residence care have? The objectives were to make a diagnosis of adolescents’ interests, needs and conceptions about sexuality and to relate these conceptions with individual factors. A transversal study was done following a quantitative methodology. A questionnaire was carried out for this research. Dependent variables were: sources of information about SE; perceptions about the role of SE on children and adolescents’ development; responsible intervener for SE; sexuality topics about which adolescents want to learn more. A convenience sample included 114 teens aged between 11 to 21 (mean=15.7±2.4; 68 females and 46 males), living 60,5% of them since more than 24 months ago in residence care. A statistical analysis was done. Results showed that in adolescents’ views, the main role of SE is: to help them to respect different sexual orientations; to understand that sexuality expresses differently along the lifespan; and to promote equal rights and opportunities between men and women. Their main sources of information are friends, internet and familiars with approximately equal age. Persons they consider to be most responsible for their SE are doctors, nurses and mothers, with significant differences for health professionals, girls having a higher preference for them than boys. Topics about which adolescents have more interest and curiosity are: love, friendship and romantic relationships; adolescence; diversity, tolerance, sexual orientation and respect; and sexually transmitted diseases and infections.

scholarly journals Give ‘til it hurts: trade-offs between immunity and male reproductive effort in the decorated cricket,Gryllodes sigillatus

2010 ◽  
Vol 23 (4) ◽  
pp. 829-839 ◽  
Author(s):  
S. N. GERSHMAN ◽  
C. A. BARNETT ◽  
A. M. PETTINGER ◽  
C. B. WEDDLE ◽  
J. HUNT ◽  
...  
Keyword(s):  
Reproductive Effort ◽  
Trade Offs ◽  
Gryllodes Sigillatus ◽  
Male Reproductive Effort ◽  
Decorated Cricket

scholarly journals Social cohesion, condom use, and sexually transmitted infections among female sex workers living with HIV in the Dominican Republic

2018 ◽  
Vol 30 (1) ◽  
pp. 64-71 ◽  
Author(s):  
MA Carrasco ◽  
C Barrington ◽  
M Perez ◽  
Y Donastorg ◽  
D Kerrigan
Keyword(s):  
Dominican Republic ◽  
Condom Use ◽  
Sexually Transmitted Infections ◽  
Social Cohesion ◽  
Sex Workers ◽  
Female Sex Workers ◽  
Pregnancy Intentions ◽  
Sexually Transmitted ◽  
Living With Hiv

This cross-sectional study examines the relationship between social cohesion with consistent condom use (CCU) and sexually transmitted infections (STIs) among the Abriendo Puertas (Opening Doors) cohort of female sex workers (FSWs) living with human immunodeficiency virus (HIV) in the Dominican Republic (n = 228). Using data from the follow-up survey of the cohort, we conducted multivariate logistic regression to explore these dynamics. Social cohesion was significantly associated with CCU between FSWs living with HIV and their clients in the last month (adjusted odds ratio [AOR] = 1.65, 95% confidence interval [CI]: 1.11–2.45) and STI prevalence among FSWs (AOR: 3.76, CI: 1.159–12.162). Social cohesion was not associated with CCU between FSWs living with HIV and their steady partners. However, both illicit drug use in the past six months (AOR = 0.11, CI: 0.023–0.57) and pregnancy intentions (AOR = 0.11; CI: 0.02–0.42) were significantly associated with CCU with steady partners. Findings highlight the differential role of social cohesion on condom use outcomes between FSWs living with HIV and their paying clients versus steady partners. Research on the pathways via which cohesion influences condom use among sex workers and their clients is merited, as is research regarding the role of drug use and pregnancy intentions on condom use with steady partners.

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