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It is a form of immune response tend towards more extensive persistent mucous mem- to the fungus lopid 300 mg line. Neutropenic patients are at risk of itraconazole or griseofulvin are effective even in ke- widespread disseminated illness 300mg lopid amex. Patients develop itchy or painful quality lopid 300 mg, erythematous scaling lesions between the Clinical features toes. It may be acute self-limiting or a persistent 1 Oral candidiasis is commonly seen in babies and chronic infection. Topical antifungal agents are usu- patients treated with antibiotics or chemotherapy. Chapter 9: Infections of the skin and soft tissue 403 r Tinea Unguium: Nail infection with ringworm is Management common especially in the elderly. Patients develop Topical shampoo containing insecticides such as mala- asymmetrical discoloured (white/yellowish black) thion and permethrin may be used, although there thickened nails with crumbling white material un- is some evidence of increasing resistance. Mechanical removal of prolonged course of systemic antifungals as for tinea lice nit combs from wet hair is an alternative strategy. Household members should be examined and treated if r Tinea Cruris: Tinea cruris affects the groin with ery- infested. Severe or refractory cases require oral antifungals as for tinea Definition capitis. Parasitic skin infections Aetiology/pathophysiology Transmission of the mite occurs by skin–skin contact Head lice with an infested individual or contaminated clothing or bedding. The mite burrows down into the stratum Definition corneumofthe skin and then the female lays eggs. Clinical features Incidence r There is often a widespread, erythematous urticating Common rash all over the body as a result of a hypersensitiv- ity reaction to the mite. Age r On examination small papules and linear tracks, Occurs mainly in school children. Pediculosiscapitis orheadlouseisagrey-whiteinsectthat grasps on to hair and sucks blood. Insects are spread by contact The burrows and distribution pattern is very suggestive but as insects can survive for hours away from the host, of the diagnosis. The mite can be visualised using a der- transfer on clothing, shared combs, towels and beds may matoscope. Management Clinical features Patients are extremely infectious and require barrier Infestations are often asymptomatic although allergy nursing. The entire skin except the face should be treated may result in itching and lymphadenopathy. All close contacts re- louse is difficult to find but eggs (nits) may be seen along quire treatment, and clothing and bed linen should be the hair shaft. They are most common in Seborrhoeic keratoses patients who burn easily and tan poorly. There is debate Definition as to whether solar keratoses leads to squamous cell car- Seborrhoeic keratoses are a benign localised prolifera- cinoma, or whether squamous cell carcinomas arise in tion of the basal layer of the epidermis. Clinical features Lesions initially appear as a small, well-demarcated, red Incidence brown plaque that progress to become more erythema- Common; by age 40 approximately 10% of individuals tousandhyperkeratotic. Sex M = F Dermatofibromas Aetiology/pathophysiology Definition The cause of seborrhoeic keratoses is unclear, although Adermatofibroma is a cutaneous nodule containing they occur more commonly on sun-exposed skin. Sex 4F:1M Management If treatment is required, cryotherapy or currettage are Aetiology/pathophysiology usually effective. Historically dermatofibromas have been associated with trauma or insect bites, although the cause is unknown. Solar keratoses Definition Clinical features Solar keratoses or actinic keratoses are single, small scaly Lesions occur most commonly on the lower limbs. Management Age Dermatofibromas are removed only if troublesome or if Occurs in the middle-aged and elderly. Chapter 9: Skin and soft tissue lumps 405 Benign naevi Large haemangiomas can trap platelets leading to thrombocytopenia (Kasabach–Merritt syndrome). Definition r Port-wine stains are irregular reddish-purple mac- Anaevus is a hamartoma of the skin (a benign over- ules caused by permanent vascular dilatation, which growth of normal tissue). A port-wine stain in r Melanocytic naevi occurring only in the dermal– the ophthalmic division of the trigeminal nerve may epidermal junction are referred to as junctional naevi. Aetiology/pathophysiology Almost all naevi are benign, but malignant change may occur with junctional naevi at greatest risk. There is a Lipoma familial dysplastic naevus syndrome (autosomal domi- Definition nant, gene on the short arm of chromosome 1). A lipoma is a lobulated slow growing benign tumour of fatty tissue encased by a thin fibrous capsule. Clinical features All individuals have one or more benign naevi, they appear as small hyperpigmented flat or slightly raised Clinical features areas of skin.

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Disease can spread when even very small amounts of faeces discount 300 mg lopid mastercard, amounts so small that they cannot be seen by the naked eye cheap lopid 300 mg overnight delivery, contaminate hands or objects and are unknowingly brought to the mouth and swallowed discount lopid 300mg on line. This is also known as the faecal-oral (faeces to mouth) route of transmission and usually occurs when hands are contaminated after using the toilet. Hands can also contaminate objects such as pencils and door-handles which are then handled, allowing the germs to pass to the next pair of hands and ultimately to the mouth of the next person, and so the infectious chain continues. Gastrointestinal spread is responsible for the spread of most infectious diarrhoea as well as some more generalised infections such as hepatitis A. Spread through the respiratory tract Some infectious diseases are spread by germs that can live and multiply in the eyes, airways (including the nose and mouth), and the lungs. These germs are easily passed from our nose or mouth to our hands and from there to other objects. Some infections are spread by droplets that are expelled by an infected person when they sneeze, cough or talk. Droplet spread usually requires the infected person and the susceptible contact to be relatively close to one another, within about 3 feet. Examples include; common cold, infuenza, meningococcal disease, mumps, rubella and pertussis (whooping cough). Other infections are spread by small aerosol droplets that remain in the air where they are carried on air currents (airborne spread) for some time after they are expelled e. Direct contact A number of infections and infestations (an infestation is when a person is infected with a parasite e. Some infections require only superfcial contact with an infected site for infection to spread e. With others, infection is only passed if there is either direct contact with the infected site or with contaminated objects. All of these infections, as well as many others can also be transmitted by sexual contact. This usually requires a breach in the skin or mucous membranes (the mucous membranes are the delicate linings of the body orifces; the nose, mouth, rectum and vagina). Intact skin provides an effective barrier to these germs and infection following contact with intact skin is extremely unlikely. However, infection can occur if the skin is broken, if someone has open cuts, or if the infected blood is carried through the skin e. It is also possible for infection to occur through sexual intercourse with an infected person. Infection can also be passed from mother-to-infant during pregnancy or at the time of delivery. The potentially serious consequence of acquiring these diseases means that all blood and body fuids must be treated as potentially infectious. This is particularly important because clinical illness is not always obvious in infected individuals. Indeed most infected individuals, pupils and staff, may not even be aware that they are carriers of these viruses. School staff should therefore assume that all blood is infectious, regardless of its source. Basic good hygiene precautions should be applied on a routine basis, rather than relying on the identifcation of infectious pupils or staff. Food which has become contaminated can then act as a vehicle to pass the germs to other people. Similarly, water that is contaminated can also act as a vehicle to pass germs to other people. Schools whose water supply is from a well or a small private group water scheme should ensure that the water quality is adequate for drinking purposes, food preparation etc. In order to do that, school staff must have a basic knowledge of common infections; know what the signs and symptoms are, and understand how infection spreads (Chapter 2). Within the school system sound infection control policies are rooted in the development of good standards of hygiene. Implementing these standards is the most effective way to interrupt the spread of infections commonly encountered in schools. If all potential targets for infection were made resistant by immunisation then the infectious chain would be broken. This approach has been successfully adopted for many of the infections that were previously common childhood, e. Exclusion of the infectious source Many infectious diseases are most transmissible as or just before symptoms develop. It is important therefore that pupils and staff who are ill when they come to school, or who develop symptoms during the school day, should be sent home.

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For the sake of these practically-focussed factsheets they refer to various means by which infection can be transferred order lopid 300 mg mastercard. Factsheet header explained The factsheet header contains a quick summary of the disease cheap 300 mg lopid fast delivery, including the most widely known names of the disease buy 300mg lopid fast delivery, symbols to indicate which taxa are affected, a brief description of the wetland types in which the disease might be found, and three boxes indicating whether or not the disease can occur in wildlife, livestock and humans, plus the level of impact the disease has on each of these groups. Wildlife Wetlands inhabited by the Livestock tsetse fly Human How the disease affects livestock e. The taxa categories are invertebrates, fish, amphibians & reptiles, birds and mammals. The taxa symbols appear in the factsheet headers in two colours: black indicates the taxa that are usually affected, and grey indicates the taxa that can also be affected (see example above). Taxa symbols Invertebrates Animals without backbones – all animals except fish, amphibians, reptiles, birds and mammals. Fish Unlike groupings such as birds or mammals, ‘fish’ (not a meaningful term for a biological grouping in itself) are not a single clade or class but a group of taxa, including hagfish, lampreys, sharks and rays, ray-finned fish, bony fish, coelacanths and lungfish - any non-tetrapod craniate with gills throughout life and limbs (if present) in the form of fins. Amphibians and reptiles (together known as herpetafauna) Animals from the classes Amphibia (such as frogs, salamanders and caecilians) and Reptilia (such as crocodiles, lizards and turtles). These categories are assigned based on impacts at the global scale rather than impacts on an individual or a population. Impact colours Severe impact Mild impact Moderate impact No impact The and symbols indicate whether or not a disease can occur in the group specified, so for example if the humans box is ticked ( ), the disease is zoonotic (can be transmitted to humans and cause disease); if the box is crossed ( ), the disease does not occur in humans. It should be noted that this symbol may refer to the disease in only some situations, i. Notifiable diseases bring trade restrictions and a range of necessary disease control measures. Trypanosomiasis is considered the most important disease of livestock in Africa where it causes severe economic losses. The disease has the greatest impact on domestic cattle but can also cause serious losses in domestic swine, camels, goats and sheep. Infection of susceptible cattle results in acute or chronic disease which is characterised by intermittent fever, anaemia, occasional diarrhoea and rapid loss of condition and often terminates in death. Although most trypanosomes that cause African animal trypanosomiasis are not known to be zoonotic, some are of zoonotic concern, e. Trypanosoma brucei rhodesiensi and other closely related trypanosomes do infect humans. Non- zoonotic trypanosomes might cause disease in people with certain genetic defects. Causal agent Trypanosomes, protozoan parasites of the genus Trypanosoma that live in the blood, lymph and various tissues of vertebrate hosts. Species affected Many species of domestic and wild animals including cattle, swine, camels, goats and sheep. Cattle are prefered by the tsetse fly and this preference can shield other animals from the effects of trypanosomiasis. Wild animals known to be infected but which are trypanotolerant include greater kudu Tragelaphus strepsiceros, warthog Phacochoerus africanus, bushbuck Tragelaphus scriptus, bush pig Potamochoerus porcus, African buffalo Syncerus caffer, African elephant Loxodonta africana, black rhinoceros Diceros bicornis, lion Panthero leo and leopard Panthera pardus. Geographic distribution Endemic in Africa, primarily occurring in areas inhabited by the tsetse fly. In Africa this falls between latitude 14° N and 29° S - that is from the southern edge of the Sahara desert to Zimbabwe, Angola and Mozambique (‘the tsetse fly belt’) an area of 10 million square miles affecting nearly 40 countries. Despite a century or more of effort to eradicate the tsetse fly, the trypanosomes have persisted across their range except in areas where all vegetation has been removed. The three main species of tsetse flies responsible for transmission are Glossina morsitans, which favours open woodland on savanna; G. Fomites (inanimate objects such as footwear, nets and other equipment) can also mechanically transmit trypanosomes. How is the disease Trypanosomes must first develop within tsetse fly vectors for one to a few transmitted to animals? They are then transmitted through tsetse fly saliva - when flies feed on an animal they inject saliva before sucking blood. Trypanosomes can also be mechanically transmitted by biting flies when these flies transfer blood from one animal to another. How does the disease Tsetse flies or mechanical vectors carrying trypanosomes from one group of spread between groups animals to another. Animals imported from endemic areas can be subclinical carriers and may become ill with the disease when stressed. Recommended action if Contact and seek assistance from appropriate animal health professionals suspected immediately if there is any illness in livestock. Diagnosis The disease should be confirmed by health professionals identifying pathogenic trypanosomes in blood or lymph node smears.

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