Publications

4856

ABSTRACT We report the draft 3.675-Mbp genome sequence of “ Candidatus Halobonum tyrrellensis” strain G22, a novel halophilic archaeon isolated from the surface hypersaline waters of Lake Tyrrell, Australia. The availability of the first genome from the “ Candidatus Halobonum” genus provides a new genomic resource for the comparative genomic analysis of halophilic Archaea .

‘Candidatus Liberibacter asiaticus’ is the most prevalent Liberibacter sp. associated with huanglongbing (HLB) in Brazil. Within São Paulo state (SP), HLB has spread more rapidly to and reached higher incidence in regions with relatively mild (cooler) summer temperatures. This suggests that climate can influence disease spread and severity. ‘Ca. L. asiaticus’ titers on soft, immature leaves from infected ‘Valencia’ sweet orange plants exposed to different temperature regimes and adult Diaphorina citri fed for 48 h on these plants for ‘Ca. L. asiaticus’ acquisition were determined by quantitative polymerase chain reaction in two experiments. The first experiment included plants with three levels of infection, three incubation periods (IPs), and air temperatures favorable (14.6 to 28°C) and unfavorable (24 to 38°C) to ‘Ca. L. asiaticus’. The second included plants with severe late-stage infections, 10 IPs (based on 3-day intervals over 27 days), and three air temperature regimes (12 to 24, 18 to 30, and 24 to 38°C). Overall, ‘Ca. L. asiaticus’ titers and the percentages of ‘Ca. L. asiaticus’-positive psyllids were lower in plants maintained at the warmer temperature regime (24 to 38°C) than in plants maintained in the cooler regimes. The results suggest that the lower incidence and slower spread of ‘Ca. L. asiaticus’ to warmer regions of SP are related to the influence of ambient temperatures on titers of ‘Ca. L. asiaticus’ in leaves.

AbstractBackgroundDuring a two year period, a 27-year-old female veterinarian experienced migraine headaches, seizures, including status epilepticus, and other neurological and neurocognitive abnormalities. Prior to and during her illness, she had been actively involved in hospital-based work treating domestic animals, primarily cats and dogs, in Grenada and Ireland and anatomical research requiring the dissection of wild animals (including lions, giraffe, rabbits, mongoose, and other animals), mostly in South Africa. The woman reported contact with fleas, ticks, lice, biting flies, mosquitoes, spiders and mites and had also been scratched or bitten by dogs, cats, birds, horses, reptiles, rabbits and rodents. Prior diagnostic testing resulted in findings that were inconclusive or within normal reference ranges and no etiological diagnosis had been obtained to explain the patient’s symptoms.MethodsPCR assays targetingAnaplasmaspp.Bartonellaspp. and hemotopicMycoplasmaspp. were used to test patient blood samples. PCR positive amplicons were sequenced directly and compared to GenBank sequences. In addition,Bartonellaalpha Proteobacteria growth medium (BAPGM) enrichment blood culture was used to facilitate bacterial growth andBartonellaspp. serology was performed by indirect fluorescent antibody testing.ResultsAnaplasma platys, Bartonella henselaeandCandidatusMycoplasma haematoparvum DNA was amplified and sequenced from the woman’s blood, serum or blood culture samples. Her serum was variably seroreactive to severalBartonellasp. antigens. Despite symptomatic improvement, six months of doxycycline most likely failed to eliminate theB. henselaeinfection, whereasA. platysandCandidatusM. haematoparvum DNA was no longer amplified from post-treatment samples.ConclusionsAs is typical of many veterinary professionals, this individual had frequent exposure to arthropod vectors and near daily contact with persistently bacteremic reservoir hosts, including cats, the primary reservoir host forB. henselae,and dogs, the presumed primary reservoir host forA. platysandCandidatusMycoplasma haematoparvum. Physicians caring for veterinarians should be aware of the occupational zoonotic risks associated with the daily activities of these animal health professionals.