Dracunculiasis: water-borne anthroponosis vs. food-borne zoonosis

2019 ◽  
Vol 94 ◽  
Author(s):  
M.T. Galán-Puchades
Keyword(s):  
Control Measures ◽  
African Countries ◽  
Secondary Importance ◽  
Food Borne ◽  
Route Of Transmission ◽  
Lower Water Level ◽  
Fish Hosts ◽  
Potential Food ◽  
Animal Reservoirs ◽  
Water Borne

Abstract Dracunculiasis is the first parasitic disease set for eradication. However, recent events related to the Dracunculus medinensis epidemiology in certain African countries are apparently posing new challenges to its eradication. Two novel facts have emerged: the existence of animal reservoirs (mainly dogs but also cats and baboons), and possibly a new food-borne route of transmission by the ingestion of paratenic (frogs) or transport (fish) hosts. Therefore, instead of being exclusively a water-borne anthroponosis, dracunculiasis would also be a food-borne zoonosis. The existence of a large number of infected dogs, mainly in Chad, and the low number of infected humans, have given rise to this potential food-borne transmission. This novel route would concern not only reservoirs, but also humans. However, only animals seem to be affected. Dracunculus medinensis is on the verge of eradication due to the control measures which, classically, have been exclusively aimed at the water-borne route. Therefore, food-borne transmission is probably of secondary importance, at least in humans. In Chad, reservoirs would become infected through the water-borne route, mainly in the dry season when rivers recede, and smaller accessible ponds, with a lower water level containing the infected copepods, appear, whilst humans drink filtered water and, thus, avoid infection. The total absence of control measures aimed at dogs (or at other potential reservoirs) up until the last years, added to the stimulating reward in cash given to those who find parasitized dogs, have presumably given rise to the current dracunculiasis scenario in Chad.

Listeriosis

2011 ◽  
Author(s):  
J. McLauchlin
Keyword(s):  
Western Europe ◽  
Economic Loss ◽  
Domestic Animals ◽  
Control Measures ◽  
Dietary Advice ◽  
Food Borne ◽  
Route Of Transmission ◽  
The Uk ◽  
Almost All ◽  
Considerable Economic Loss

Listeriosis occurs in a variety of animals including humans, and most often affects the pregnant uterus, the central nervous system (CNS) or the bloodstream. During pregnancy, infection spreads to the foetus, which will either be born severely ill or die in-utero. In non-pregnant animals, listeriosis usually presents as meningitis, encephalitis. In humans, infection most often occurs in the immunocompromised and elderly, and to a lesser extent the pregnant woman, the unborn, or the newly delivered infant. Infection can be treated successfully with antibiotics, however 20–40% of human cases are fatal..In domestic animals (especially in sheep and goats) listeriosis usually presents as encephalitis, abortion, or septicaemia, and is a cause of considerable economic loss.The genus Listeria comprises six species of Gram-positive bacteria. Almost all cases of listeriosis are due to Listeria monocytogenes although up to 10% of cases in sheep are due to Listeria ivanovii.Listeriae are ubiquitous in the environment worldwide, especially in sites with decaying organic vegetable material. Many animals carry the organism in the faeces without serious infection. The consumption of contaminated food or feed is the principal route of transmission for both humans and animals, however other means of transmission occur.Human listeriosis is rare (<1 to > 10 cases per million people in North America and Western Europe), but because of the high mortality rate, it is amongst the most important causes of death from food-borne infections in industrialized countries. In the UK, human listeriosis is the biggest single cause of death from a preventable food-borne disease. Listeriosis in domestic animals is a cause of considerable economic loss. Control measures should be directed towards both to exclude Listeria from food or feed as well as inhibiting its multiplication and survival. Silage which is spoiled or mouldy should not be used, and care should be taken to maintain anaerobic conditions for as long as possible.Dietary advice is available for disease prevention, particularly targeted at ‘at risk’ individuals to modify their diet to avoid eating specific foods such as soft cheese and pâté.

scholarly journals Community-based geographical distribution of Mycobacterium ulcerans VNTR-genotypes from the environment and humans in the Nyong valley, Cameroon

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
Francis Zeukeng ◽  
Anthony Ablordey ◽  
Solange E. Kakou-Ngazoa ◽  
Stephen Mbigha Ghogomu ◽  
David N’golo Coulibaly ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Tandem Repeats ◽  
Buruli Ulcer ◽  
Variable Number ◽  
Mycobacterium Ulcerans ◽  
Community Based ◽  
Human Samples ◽  
Route Of Transmission ◽  
Mode Of Transmission ◽  
Animal Reservoirs

Abstract Background Genotyping is a powerful tool for investigating outbreaks of infectious diseases and it can provide useful information such as identifying the source and route of transmission, and circulating strains involved in the outbreak. Genotyping techniques based on variable number of tandem repeats (VNTR) are instrumental in detecting heterogeneity in Mycobacterium ulcerans (MU) and also for discriminating MU from other mycobacteria species. Here, we describe and map the distribution of MU genotypes in Buruli ulcer (BU) endemic communities of the Nyong valley in Cameroon. We also tested the hypothesis of whether the suspected animal reservoirs of BU that share the human microhabitat are shedding contaminated fecal matters and saliva into their surrounding environments. Methods Environmental samples from suspected MU-risk factors and lesion swabs from human patients were sampled in BU-endemic communities and tested for the presence of MU by qPCR targeting three independent sequences (IS2404, IS2606, KR-B). Positive samples to MU were further genotyped by VNTR with confirmation by sequencing of four loci (MIRU1, Locus 6, ST1, Locus 19). Results MU was detected in environmental samples including water bodies (23%), biofilms (14%), detritus (10%), and in human patients (73%). MU genotypes D, W, and C were found both in environmental and human samples. The micro geo-distribution of MU genotypes from communities showed that genotype D is found both in environmental and human samples, while genotypes W and C are specific to environmental samples and human lesions, respectively. No obvious focal grouping of MU genotypes was observed at the community scale. An additional survey in the human microhabitat suggests that domestic and wild animals do not shed MU in their saliva and feces in sampled communities. Conclusions VNTR typing uncovered different MU genotypes circulating in the endemic communities of the Akonolinga district. A MU environmental genotype was found in patients, yet the mechanism of contamination remains to be investigated; and recovering MU in culture from the environment remains key priority to enable a better understanding of the mode of transmission of BU. We also conclude that excretions from suspected animals are unlikely to be major sources of MU in the Nyong Valley in Cameroon.

scholarly journals A Household-Based Cross-Sectional Survey of Knowledge, Awareness and Practice Regarding Malaria in Western Area Rural District, Sierra Leone

2021 ◽  
Vol 9 ◽  
Author(s):  
Lili Wang ◽  
Jianhai Yin ◽  
Canjun Zheng ◽  
Samuel Juana Smith ◽  
Esther Ngegba ◽  
...  
Keyword(s):  
Sierra Leone ◽  
Public Awareness ◽  
Malaria Prevention ◽  
Rural District ◽  
Control Measures ◽  
Capital City ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Western Area ◽  
Route Of Transmission

Sierra Leone is a highly endemic area for malaria, and the implementation of the National Malaria Strategic Plan (2016–2020) has reached its midpoint in 2018. To provide more specific guidance for interventions in the future, a household-based cross-sectional survey was conducted to elucidate the knowledge, awareness and practices regarding malaria and malarial control measures among the general public. Three communities (Grafton, Jui, and Kossoh) in the Western Area Rural District that were in close proximity to Sierra Leone's capital city of Freetown were included. Households were randomly selected and interviewed with a structured questionnaire covering malaria infection, diagnosis, treatment and prevention, as well as knowledge of malaria prevention. As a result, a total of 262 qualified questionnaires were included. The average cost for meals per day is ~30,000 Leones in each household. The rate of awareness, indicated by reporting having heard of malaria, was 98.1% (257/262), and 86.6% (227/262) of the respondents knew that mosquito bites are the main route of transmission. In addition, 80.9% (212/262) of the respondents sought health advice or treatment for the illness, and a similar percentage of respondents had been tested for malaria, mostly with rapid diagnostic tests (RDTs). A high demand for long-lasting insecticidal nets (72.1%) matched the serious shortage (61.8%, 162/262), and of the households that reported a lack of nets, 66 had children younger than 5 years old. In conclusion, public awareness of malaria prevention is high, based on this survey, although there was a limited use of preventive measures in these three communities and the malaria burden was still high. Therefore, the public's knowledge of malaria should be sustained and reinforced, and the distribution and use of malaria prevention measures should be promoted to supprt the achievement of the planned objectives.

One Health and Parasites

2019 ◽  
pp. 82-112
Author(s):  
Said Sajjad Ali Shah ◽  
Adnan Khan
Keyword(s):  
One Health ◽  
Health Workers ◽  
Animal Health ◽  
Health Issues ◽  
Food Borne ◽  
Contaminated Food ◽  
Parasitic Zoonoses ◽  
Public Health Workers ◽  
Etiological Agents ◽  
Water Borne

One health is a collective term used to address human and animal health issues under one platform. More than half of the diseases of humans are directly or indirectly related to animal health and spread from animals to humans or vice versa. Etiological agents of zoonotic diseases may be bacterial, viral, or parasitic in origin. Among them, parasitic agents are very important because they are either directly involved as etiological agents or as vectors of other pathogenic organisms. Parasitic zoonoses are transmitted to humans through vectors, food, or drinking water, and thus categorized as vector borne, food borne, and water borne parasitic zoonoses. Food borne and water borne parasitic zoonoses include all those parasitic diseases which are transmitted to humans by consuming contaminated food and water. An extensive alliance is necessary amongst physicians, veterinarians, and public health workers for timely response and approach to guarantee the prevention and management of infections.

scholarly journals Vírus Zika: Revisão para Clínicos

2015 ◽  
Vol 28 (6) ◽  
pp. 760 ◽  
Author(s):  
Vitor Laerte Pinto Junior ◽  
Kleber Luz ◽  
Ricardo Parreira ◽  
Paulo Ferrinho
Keyword(s):  
Yellow Fever ◽  
Yellow Fever Virus ◽  
Abrupt Onset ◽  
Fever Virus ◽  
Control Measures ◽  
African Countries ◽  
The Pacific ◽  
Rapid Spread ◽  
Sporadic Cases ◽  
Virus Zika

Zika virus is a flavivirus related to Dengue virus, yellow fever virus and West Nile virus. It is considered an emerging arbovirus transmitted by mosquitos of the genus Aedes. Its first description took place in 1947 in the Zika Forest in Uganda, isolated on Rhesus monkey used as bait to study the yellow fever virus. Sporadic cases have been detected in African countries and at the end of the 70’s in Indonesia. In 2007, epidemics were described in Micronesia and other islands in the Pacific Ocean and more recently in Brazil. Clinical picture is characterized as a ‘dengue-like’ syndrome, with abrupt onset of fever and an early onset evanescent rash, often pruritic. Occasionally the disease has been associated with Guillain-Barré syndrome. Nevertheless, until now deaths and complications caused by the disease were not reported. The diagnosis can be performed by PCR or by IgG and IgM antibodies detection. The rapid spread of the virus and its epidemic potential are especially problematic in countries where there are the circulation of other arboviruses which<br />imposes difficulties in the differential diagnosis and healthcare burden. Control measures are the same recommended for dengue and chikungunya which are based in health education and vector control.

scholarly journals Sensitivity of Escherichia albertii, a Potential Food-Borne Pathogen, to Food Preservation Treatments

2007 ◽  
Vol 73 (13) ◽  
pp. 4351-4353 ◽  
Author(s):  
Manan Sharma ◽  
Kalmia E. Kniel ◽  
Alexandra Derevianko ◽  
Jason Ling ◽  
Arvind A. Bhagwat
Keyword(s):  
Diarrheal Disease ◽  
Food Preservation ◽  
Wild Type ◽  
E Coli ◽  
Acid Ph ◽  
Food Borne ◽  
Potential Food

ABSTRACT Escherichia albertii is a potential food-borne pathogen because of its documented ability to cause diarrheal disease by producing attachment and effacement lesions. Its tolerances to heat (56°C), acid (pH 3.0), and pressure (500 MPa [5 min]) were evaluated and found to be significantly less than those of wild-type E. coli O157:H7.

Parasitic food-borne and water-borne zoonoses

2000 ◽  
Vol 19 (1) ◽  
pp. 240-258 ◽  
Author(s):  
C.N.L. MACPHERSON ◽  
B. GOTTSTEIN ◽  
S. GEERTS
Keyword(s):  
Food Borne ◽  
Water Borne
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