Publications by authors named "Calchi A"

More than one-hundred species that affect animals and humans have been described, eight of which have been associated with emerging and underdiagnosed zoonoses. Most diagnostic studies in humans have used serology or molecular assays based on the 18S rRNA gene. Because the 18S rRNA gene is highly conserved, obtaining an accurate diagnosis at the species level is difficult, particularly when the amplified DNA fragment is small.

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Wolbachia is an intracellular endosymbiont bacterium found in nematodes and arthopods. Regarding mites, the Wolbachia supergroup U has been described based on strains found in the genus Spinturnix. In this study, ten specimens of Periglischrus iheringi (Mesostigmata: Spinturnicidae), collected from Artibeus obscurus (Chiroptera: Phyllostomidae) in Santa Catarina State, were found to be infected with Wolbachia.

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Among mammals, bats stand out as important reservoirs for Bartonella spp., second only to rodents. In Brazil, out of the 182 species of bats described, three are hematophagous: Desmodus rotundus, Diphylla ecaudata and Diaemus youngii.

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Article Synopsis
  • Armadillos and anteaters interact with various pathogens and parasites, making them potential hosts for zoonotic diseases, but research on these interactions is limited.
  • A study in Brazil analyzed 167 samples from different species of armadillos and anteaters to identify occurrences of pathogens like Ehrlichia, Anaplasma, Bartonella, and hemoplasmas.
  • Results showed low detection rates, with only one positive sample each for Anaplasma in six-banded armadillos and Ehrlichia in giant anteaters, indicating the need for further research on disease dynamics in these mammals.
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  • Babesia spp. and Theileria spp. are protozoan parasites transmitted by ticks, affecting both animals and humans, with deer identified as reservoirs for these pathogens.
  • A study analyzed DNA from 181 wild deer in four Brazilian states, revealing a high prevalence (75.14%) of piroplasmids, particularly Theileria species, with varying genetic diversity related to deer species.
  • Phylogenetic analysis indicated distinct clades for different deer genera and identified new Theileria lineages, highlighting potential zoonotic risks and the importance of understanding parasite specificity in deer populations.
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Despite the great diversity of bats (64 species) in the State of Acre, northwestern Brazil, there are no studies on occurrence and diversity of Bartonella spp. in bats in this region. The present study investigated the occurrence and molecular identity of Bartonella spp.

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  • Babesia and Bartonella co-infections are increasingly recognized in patients with chronic illnesses, challenging traditional views on infectious diseases.
  • This study uses advanced molecular diagnostics to confirm Babesia odocoilei infections in humans, revealing a higher occurrence than previously thought.
  • Six out of seven infected individuals also had co-infections with different Bartonella species, highlighting the need for more awareness and understanding of these pathogen dynamics.
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Despite numerous reports of Anaplasmataceae agents in mammals worldwide, few studies have investigated their occurrence in birds. The present study aimed to investigate the occurrence and molecular identity of Anaplasmataceae agents in birds from the Pantanal wetland, Brazil. Blood samples were collected from 93 different species.

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Piroplasmids and Hepatozoon spp. Are apicomplexan protozoa that may cause disease in several canid species. The present study aimed to expand the knowledge on the diversity of piroplasmids and Hepatozoon in crab-eating foxes (Cerdocyon thous; n = 12) sampled in the Pantanal of Mato Grosso do Sul State, central-western Brazil.

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  • - The study focused on assessing the bacterial load and molecular details of Coxiella burnetii in pregnant and postpartum ewes from Saint Kitts, using previously collected positive samples from Barbados Blackbelly ewes.
  • - Techniques like real-time qPCR were employed to analyze various samples (vaginal mucus, feces, and milk) for the presence of C. burnetii DNA, revealing equal amounts of bacterial DNA across these sample types.
  • - Molecular characterization showed a high diversity of C. burnetii haplotypes, indicating they are widespread, with similarities found in other ruminants and even ticks and humans.
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Despite the worldwide occurrence and high genetic diversity of Bartonella spp. in bats, few studies investigate their occurrence in bat-associated mites. To date, 26 species of Macronyssidae mite species have been reported from Brazil, and 15 of which were found parasitizing bats.

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Despite the worldwide occurrence of bartonellae in a broad range of mammal species, in which they usually cause a long-lasting erythrocytic bacteremia, few studies reported Bartonella spp. in avian hosts. The present work aimed to investigate the occurrence and molecular identity of Bartonella spp.

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The genus Goniodes Nitzsch and Goniocotes Burmeister (Ischnocera: Goniogodidae) are distributed worldwide, and exclusively parasitizing avian hosts of the Galliformes. In Brazil, there are only four species recorded: Goniodes dissimilis Denny, Goniodes gigas (Taschenberg), Goniodes pavonis (L.), and Goniocotes gallinae (DeGeer).

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A male of Pteronura brasiliensis (Carnivora: Mustelidae) was found dead on the banks of the Rio Negro, in the Pantanal wetlands of Mato Grosso do Sul state, Aquidauana municipality. Two ticks found attached to its skin were morphologically identified as a second-instar nymph of Ornithodoros rostratus (Argasidae) and a male of Amblyomma sculptum (Ixodidae). In order to complement the morphological identification, these tick specimens were subjected to DNA extraction, and tested using PCR assays to confirm the molecular identity the specimens.

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Xenarthra mammals can be found from southern North America to southern South America, including all Brazilian biomes. Although it has been shown that Xenarthra mammals can play a role as reservoirs for several zoonotic agents, few studies investigate the diversity of piroplasmids (Apicomplexa: Piroplasmida) in this group of mammals. Taking into account that piroplasmids can cause disease in animals and humans, understanding the prevalence and diversity of piroplasmids in Xenarthra mammals would contribute to conservation efforts for this group of animals as well as to infer risk areas for transmission of emergent zoonosis.

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Piroplasmids (order Piroplasmida) are a diverse group of tick-borne protozoa that may cause disease in animals and occasionally in humans. Novel Piroplasmida clades and species have been found in wild animals from Brazil based on the phylogenetic assessment of near-complete 18S rRNA, mitochondrial and heat-shock protein genes. For instance, a putative novel species has been detected in capybaras and ticks in three Brazilian states.

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Article Synopsis
  • This study looked at how often a bacteria called C. burnetii was found in various samples (like vaginal mucus, feces, and milk) from pregnant and new mother ewes on Saint Kitts.
  • They found that about 87% of the ewes were shedding this bacteria in at least one of those ways, with pregnant ewes showing more bacteria in their vaginal mucus and feces than the new mothers.
  • The study also discovered that even though many ewes had antibodies against C. burnetii, there wasn't a clear connection between having those antibodies and shedding the bacteria, making it the first detection of this bacteria in the Caribbean.
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Opossums are synanthropic marsupials able to interchange among wild, peri‑urban and urban environments, playing an epidemiologically important role as hosts for emerging pathogens and ectoparasites of relevance in public health. The present study aimed to detect and molecularly characterize vector-borne agents in a population of common opossums (Didelphis marsupialis) from the Island of São Luís do Maranhão, northeastern Brazil. Of the 45 animals analyzed, one (2.

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The growing proximity of wildlife to large urban niches arouses greater interest in understanding wild reservoirs in the epidemiology of diseases of importance to animal and human health. The aim of the present study was to investigate the presence of piroplasmids in opossums rescued from the metropolitan region of Rio de Janeiro state, Brazil. Blood and bone marrow samples were collected from 15 Didelphis aurita and subjected to DNA extraction and PCR using primers for the 18S rRNA, cox1, cox3, and hsp70 genes of piroplasmids.

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There is a growing concern about the participation of wild hosts and reservoirs in the epidemiology of several pathogens, particularly within the context of environmental changes and the expansion of the One Health concept. The aim of this study was to investigate the presence of hemoplasmas in opossums rescued from the metropolitan region of Rio de Janeiro state, Brazil. Blood samples were collected from 15 Didelphis aurita and subjected to DNA extraction and PCR using primers for the 16S rRNA and 23S rRNA genes.

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Procyonids are reservoirs of many zoonotic infectious diseases, including tick-borne pathogens. The role of coatis (Nasua nasua) in the epidemiology of piroplasmids and Rickettsia has not been fully addressed in Brazil. To molecularly study these agents in coatis and associated ticks, animals were sampled in two urban areas in Midwestern Brazil.

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  • The study evaluated the prevalence of IgG antibodies against A. marginale and the bacterium's occurrence in dairy cattle, focusing on its connection to clinical issues like retained placenta, mastitis, and abomasal displacement.
  • In a sample of 179 Holstein cows from three farms in Brazil, seropositivity rates varied significantly, with Farm A at 54%, Farm B at 69.4%, and Farm C at 27.3%, while qPCR indicated an overall 34.6% positivity.
  • The results revealed that cows testing positive for A. marginale had a drastically higher likelihood (52.48 times) of experiencing retained placenta and mastitis, underscoring the importance of preventative measures to reduce morbidity and
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The Anaplasmataceae family encompasses obligate intracellular α-proteobacteria of human and veterinary medicine importance. This study performed multi-locus sequencing to characterize and in coati's blood samples in Midwestern Brazil. Twenty-five samples (25/165-15.

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