Person: Olmeda García, Ángeles Sonia
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First Name
Ángeles Sonia
Last Name
Olmeda García
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Veterinaria
Department
Sanidad Animal
Area
Sanidad Animal
Identifiers
9 results
Search Results
Now showing 1 - 9 of 9
Item Acaricidal and Repellent Effects of Essential Oils against Ticks: A Review(Pathogens, 2021) Selles, Sidi Mohammed Ammar; Kouidri, Mokhtaria; González, Marta G.; González, Julia; Sánchez, María; González Coloma, Azucena; Sanchis, Jaime; Elhachimi, Latifa; Olmeda García, Ángeles Sonia; Tercero, José Maria; Valcárcel, FélixTick control is a priority in order to prevent the transmission of vector-borne diseases. Industrial chemical acaricides and repellents have been the most efficient tools against hard ticks for a long time. However, the appearance of resistances has meant the declining effectiveness of the chemicals available on the market. The trend today is to develop alternative control methods using natural products to replace nonefficient pesticides and to preserve the efficient ones, hoping to delay resistance development. Traditional in vitro evaluation of acaricidal activity or resistance to synthetic pesticides have been reviewed and they mainly focus on just one species, the one host tick (Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)). Recent reports have called for the standardization of natural product components, extraction techniques, and experimental design to fully discover their acaricidal potential. This study reviews the main variables used in the bibliography about the efficiency of natural products against ticks, and it proposes a unification of variables relating to ticks, practical development of bioassays, and estimation of ixodicidal activity.- Project number: 175
Item ¿Qué parásito soy?: aprendizaje lúdico de la Parasitología mediante el empleo de pistas e imágenes(2020) Gómez Muñoz, María Teresa; Azami Conesa, Iris; Juan Ferré, Lucía De; Hernández Carrillo, Javier; Luzón Peña, Mónica; Martínez Díaz, Rafael Alberto; Olmeda García, Ángeles SoniaLa Parasitología emplea muchos conceptos, nombres, taxonomía e imágenes que complican el aprendizaje. Desarrollaremos una actividad basada en el juego para relacionar conceptos e imágenes, al tiempo que los alumnos evalúan su evolución de aprendizaje. La actividad se desarrollará en una página web. Item Alpha-Gal, epitope responsible for allergy to red meat, in the Mediterranean tick Hyalomma lusitanicum(Medical and Veterinary Entomology, 2024) Valcárcel Olmeda, Ángela; Briones Montero, Andrea; Rodero Martínez, Marta; González Fernández, Juan; Olmeda García, Ángeles Sonia; Valcárcel, Félix; Cuéllar Del Hoyo, María Del CarmenAlpha-Gal/α-Gal is an oligosaccharide produced by non-primate mammals. Humans have developed an immune response mediated by anti-α-Gal antibodies that can trigger an allergic reaction and cause anaphylaxis. In recent years, cases of patients with delayed allergic reaction to mammalian meat have been reported worldwide. In Spain, these cases have been related to the species Ixodes ricinus L. (Ixodida: Ixodidae), whose distribution is located in the north of the country. In this work, the presence of α-Gal in water-soluble extracts from samples of salivary glands and digestive tracts of Hyalomma lusitanicum Koch (Ixodida: Ixodidae) both engorged and collected from vegetation were studied. The presence of that epitope was confirmed by the presence of reactive proteins of >250 kDa in both samples. The highest concentrations of α-Gal were detected in salivary glands. Neither sex nor diet influenced the concentration of α-Gal, which seems to indicate its endogenous production and its possible inoculation to the host during tick feeding.- Project number: 56
Item Parásitos en movimiento: Videoteca docente(2023) Gómez Muñoz, María Teresa; Montoya Matute, Ana; Olmeda García, Ángeles Sonia; Juan Ferré, Lucía De; Azami Conesa, Iris; Barrera Martín, Juan Pedro; Carbonell Bonelo, Juan David; Hurtado Corral, Izaskum; Valcárcel Sancho, Félix; Meana Mañes, María Aranzazu Item Bioactive Metabolites from the Endophytic Fungus Aspergillus sp. SPH2(Journal of Fungi, 2021) Morales Sánchez, Viridiana; Díaz, Carmen E.; Trujillo, Elena; Olmeda García, Ángeles Sonia; Valcarcel, Felix; Muñoz, Rubén; Andrés, María Fe; González Coloma, AzucenaIn the current study, an ethyl acetate extract from the endophytic fungus Aspergillus sp. SPH2 isolated from the stem parts of the endemic plant Bethencourtia palmensis was screened for its biocontrol properties against plant pathogens (Fusarium moniliforme, Alternaria alternata, and Botrytis cinerea), insect pests (Spodoptera littoralis, Myzus persicae, Rhopalosiphum padi), plant parasites (Meloidogyne javanica), and ticks (Hyalomma lusitanicum). SPH2 gave extracts with strong fungicidal and ixodicidal effects at different fermentation times. The bioguided isolation of these extracts gave compounds 1–3. Mellein (1) showed strong ixodicidal effects and was also fungicidal. This is the first report on the ixodicidal effects of 1. Neoaspergillic acid (2) showed potent antifungal effects. Compound 2 appeared during the exponential phase of the fungal growth while neohydroxyaspergillic acid (3) appeared during the stationary phase, suggesting that 2 is the biosynthetic precursor of 3. The mycotoxin ochratoxin A was not detected under the fermentation conditions used in this work. Therefore, SPH2 could be a potential biotechnological tool for the production of ixodicidal extracts rich in mellein.Item Assessment of Repellency and Acaricidal Potential of Nigella sativa Essential Oil Using Rhipicephalus microplus Ticks(Pakistan Veterinary Journal, 2023) Al-Hoshani, Nawal; Zaman, Muhammad Arfan; Al Syaad, Khalid M.; Salman, Muhammad; Ur Rehman, Tauseef; Olmeda García, Ángeles SoniaOwing to the development of resistance in ticks, the presence of drug residues in food products and the non-target toxicity associated with synthetic acaricides, the scientists are forced to discover some other effective tick control alternatives like botanicals. Hence, in this perspective, the current study was focused on the investigation of repellent and acaricidal potential of Nigella (N.) sativa essential oil against the Rhipicephalus (R.) microplus ticks. Moreover, this research also included the phytochemical analysis of N. sativa essential oil through GC-FID procedure which indicated nerol to be its major constituent. Both the repellent and the acaricidal experiments were conducted using the N. sativa essential oil at 1, 2.5, 5, 10 and 20% v/v dilutions. The results of these experiments indicated the N. sativa essential oil to exert repellent, acaricidal and reproductive effects in terms of various parameters with dose-dependent responses. Thus, the N. sativa essential oil may serve as an effective alternative for the control of R. microplus tick infestation.Item Comparative Ecology of Hyalomma lusitanicum and Hyalomma marginatum Koch, 1844 (Acarina: Ixodidae)(Insects, 2020) Valcárcel, Félix; González, Julia; González, Marta G.; Sánchez, María; Tercero, José María; Elhachimi, Latifa; Carbonell Bonelo, Juan David; Olmeda García, Ángeles SoniaThe genus Hyalomma belongs to the Ixodidae family and includes many tick species. Most species in this genus are African species, but two of them, Hyalomma lusitanicum and Hyalomma marginatum, are also found in Europe and, owing to their morphological similarity, it is very difficult to tell them apart. This is a major concern because their phenology and vector capacities are quite different. Moreover, they share many habitats and both are currently spreading to new areas, probably due to climate change and animal/human movements. In this study, we review the described ecology of the two species and provide further interesting data on H. lusitanicum based on the authors’ experience, which could be useful in assessing the risk they pose to humans and animals.Item Seasonality of Coxiella burnetii among Wild Rabbits (Oryctolagus cuniculus) and the Hyalomma lusitanicum (Acari: Ixodidae) in a Meso-Mediterranean Ecosystem(Pathogens, 2021) Sánchez, María; Valcárcel, Félix; González, Julia; González, Marta G.; Martín Hernández, Raquel; Tercero, José M.; González Jara, Pablo; Olmeda García, Ángeles Sonia(1) Background: Q fever is a worldwide zoonosis caused by Coxiella burnetii that have cases reported in humans and animals almost everywhere. The aim of this study was to describe the seasonality of Coxiella burnetii in the wild rabbit (Oryctolagus cuniculus) and the tick Hyalomma lusitanicum in a meso-Mediterranean ecosystem. (2) Methods: two populations of wild rabbits that differ in whether or not they share habitat with ungulates, mainly red deer (Cervus elaphus) were sampled for a year to collect ticks, blood and vaginal or anal swabs. Presence of C. burnetii DNA in swabs and the tick H. lusitanicum was determined by PCR and serum antibodies by ELISA. (3) Results: C. burnetii DNA was detected in 47.2% of 583 rabbits, in 65.5% of sera, and in more than half of the H. lusitanicum. There were small variations according to sex and age of the rabbits but significant according to the habitat (4) Conclusions: The results indicate that C. burnetii circulates freely between wild rabbits and H. lusitanicum and the sylvatic cycle in meso-Mediterranean environments relies in the presence of wild rabbits and H. lusitanicum above all if sharing habitat with red deer.Item Ticks and Tick-Borne Pathogens Abound in the Cattle Population of the Rabat-Sale Kenitra Region, Morocco(Pathogens, 2021) Elhachimi, Latifa; Rogiers, Carolien; Casaert, Stijn; Fellahi, Siham; Van Leeuwen, Thomas; Dermauw, Wannes; Valcárcel, Félix; Olmeda García, Ángeles Sonia; Daminet, Sylvie; Khatat, Sarah El Hamiani; Sahibi, Hamid; Duchateau, LucTick-borne pathogens cause the majority of diseases in the cattle population in Morocco. In this study, ticks were collected from cattle in the Rabat-Sale-Kenitra region of Morocco and identified morphologically, while tick-borne pathogens were detected in cattle blood samples via polymerase chain reaction assay and sequencing. A total of 3394 adult ixodid ticks were collected from cattle and identified as eight different tick species representing two genera, Hyalomma and Rhipicephalus. The collected ticks consisted of Hyalomma marginatum, Hyalomma anatolicum excavatum, Rhipicephalus sanguineus sensu lato, Rhipicephalus bursa, Hyalomma detritum, Hyalomma lusitanicum, Hyalomma dromedarii, and Hyalomma impeltatum. The overall prevalence of tick-borne pathogens in blood samples was 63.8%, with 29.3% positive for Babesia/Theileria spp., 51.2% for Anaplasma/Ehrlichia spp., and none of the samples positive for Rickettsia spp. Sequencing results revealed the presence of Theileria annulata, Babesia bovis, Anaplasma marginale, Theileria buffeli, Theileria orientalis, Babesia occultans, Anaplasma phagocytophilum, Anaplasma capra, Anaplasma platys, Anaplasma bovis, Ehrlichia minasensis, and one isolate of an unknown bovine Anaplasma sp. Crossbreeds, females, older age, and high tick infestation were the most important risk factors for the abundance of tick-borne pathogens, which occurred most frequently in Jorf El Melha, Sidi Yahya Zaer, Ait Ichou, and Arbaoua locations.