Helga Waap

Dr. Helga Waap

Instituto Nacional de Investigação Agrária e Veterinária, Lisbon, Lisboa, Portugal
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Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 November 2006 in Veterinary Parasitology
Verified
Journal Article
Closed access
HCH.C.E. Cortes
H.C.E. Cortes
YRY. Reis
Y. Reis
HWHelga Waap
Helga Waap
RVR. Vidal
R. Vidal
HSH. Soares
H. Soares
ALAlexandre Leitão
Alexandre Leitão

30 May 2013 in Journal of Helminthology
Verified
Journal Article
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HWHelga Waap
Helga Waap
Jacinto GomesJacinto Gomes
Jacinto Gomes
TNTelmo Nunes
Telmo Nunes
Stray cats live in high-density colonies in urban areas and pose a health hazard to household cats and humans. In Portugal, information on the parasitic fauna of stray cats is limited and relies mostly on results from faecal analysis. The present survey aimed to determine the prevalence, diversity and intensity of parasites in stray cats from the urban area of Lisbon by means of parasitological necropsy. Internal organs were collected from 162 cats captured in different areas of the city and systematically subjected to parasitological dissection. Helminths were identified by macro- and microscopic examination and protozoa by faecal floatation and sedimentation techniques. The overall prevalence of parasites was 90.7% (95% confidence interval (CI): 85.3–94.6%). A total of 12 parasite species was recorded:Cystoisospora felis(14.2%),Cystoisospora rivolta(46.3%),Sarcocystissp. (1.2%),Ancylostoma tubaeforme(19.1%),Toxocara cati(38.3%),Ollulanus tricuspis(30.9%),Aelurostrongylus abstrusus(12.4%), Eucoleus aerophilus(0.6%),Taenia taeniaeformis(3.1%),Dipylidium caninum(53.1%),Joyeuxiella pasqualei(15.4%) andDiplopylidium nölleri(3.7%). Overall mean species richness was 2.36 ± 1.52. Helminth mean intensity was highest forO. tricuspis(285.8), followed byD. caninum(42.4),J. pasqualei(14.4),A. tubaeforme(8.1) andT. cati(5.9). The prevalence and variety of parasites found in our sampling are substantially higher than the numbers previously reported in Portugal. Some of the parasites, includingT. catiandA. tubaeforme,are zoonotic, which emphasizes the need for parasite control strategies based on demographic containment of stray cat populations in urban areas to promote public health protection.

6 January 2023 in Pathogens
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Journal Article
Open access
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FDFilip Dámek
Filip Dámek
ASArno Swart
Arno Swart
HWHelga Waap
Helga Waap
PJPikka Jokelainen
Pikka Jokelainen
DRDelphine Le Roux
Delphine Le Roux
MOMarieke Opsteegh
Marieke Opsteegh
Toxoplasma gondii is a zoonotic parasite of importance to both human and animal health. The parasite has various transmission routes, and the meat of infected animals appears to be a major source of human infections in Europe. We aimed to estimate T. gondii prevalence in a selection of animal host species. A systematic literature review resulting in 226 eligible publications was carried out, and serological data were analyzed using an age-dependent Bayesian hierarchical model to obtain estimates for the regional T. gondii seroprevalence in livestock, wildlife, and felids. Prevalence estimates varied between species, regions, indoor/outdoor rearing, and types of detection methods applied. The lowest estimated seroprevalence was observed for indoor-kept lagomorphs at 4.8% (95% CI: 1.8–7.5%) and the highest for outdoor-kept sheep at 63.3% (95% CI: 53.0–79.3%). Overall, T. gondii seroprevalence estimates were highest within Eastern Europe, whilst being lowest in Northern Europe. Prevalence data based on direct detection methods were scarce and were not modelled but rather directly summarized by species. The outcomes of the meta-analysis can be used to extrapolate data to areas with a lack of data and provide valuable inputs for future source attribution approaches aiming to estimate the relative contribution of different sources of T. gondii human infection.

1 July 2012 in Veterinary Parasitology
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Journal Article
Closed access
HWHelga Waap
Helga Waap
RCRita Cardoso
Rita Cardoso
ALAlexandre Leitão
Alexandre Leitão
TNTelmo Nunes
Telmo Nunes
AVAnabela Vilares
Anabela Vilares
HÂHelena Ângelo
Helena Ângelo

1 November 2008 in Veterinary Parasitology
Verified
Journal Article
Closed access
HWHelga Waap
Helga Waap
AVAnabela Vilares
Anabela Vilares
EREugénia Rebelo
Eugénia Rebelo
SGSalomé Gomes
Salomé Gomes
HÂHelena Ângelo
Helena Ângelo

1 October 2014 in Veterinary Parasitology
Verified
Journal Article
Closed access
AVAnabela Vilares
Anabela Vilares
MGM.J. Gargaté
M.J. Gargaté
IFI. Ferreira
I. Ferreira
SMS. Martins
S. Martins
CJC. Júlio
C. Júlio
João Paulo GomesJoão Paulo Gomes
João Paulo Gomes