A study on the use of thermal imaging as a diagnostic tool for the detection of digital dermatitis in dairy cattle

Our aims were to (1) determine how interdigital skin temperature (IST), measured using infrared thermography, was associated with different stages of digital dermatitis (DD) lesions and (2) develop and validate models that can use IST measurements to identify cows with an active DD lesion. Between March 2019 and March 2020, infrared thermographic images of hind feet were taken from 2,334 Holstein cows across 4 farms. We recorded the maximum temperature reading from infrared thermographic images of the interdigital skin between the heel bulbs on the hind feet. Pregnant animals were enrolled approximately 1 to 2 mo precalving, reassessed 1 wk after calving, and again at approximately 50 to 100 d postpartum. At these time points, IST and the clinical stage of DD (M-stage scoring system: M1-M4.1) were recorded in addition to other data such as the ambient environmental temperature, height, body condition score, parity, and the presence of other foot lesions. A mixed effect linear regression model with IST as the dependent variable was fitted. Interdigital skin temperature was associated with DD lesions; compared to healthy feet, IST was highest in feet with M2 lesions, followed by M1 and M4.1 lesions. Subsequently, the capacity of IST measurements to detect the presence or absence of an active DD lesion (M1, M2, or M4.1) was explored by fitting logistic regression models, which were tested using 10-fold validation. A mixed effect logistic regression model with the presence of active DD as the dependent variable was fitted first. The average area under the curve for this model was 0.80 when its ability to detect presence of active DD was tested on 10% of the data that were not used for the model's training; an average sensitivity of 0.77 and an average specificity of 0.67 was achieved. This model was then restricted so that only explanatory variables that could be practically recorded in a nonresearch, external setting were included. Validation of this model demonstrated an average area under the curve of 0.78, a sensitivity of 0.88, and a specificity of 0.66 for 1 of the time points (precalving). Lower sensitivity and specificity were achieved for the other 2 time points. Our study adds further evidence to the relationship between DD and foot skin temperature using a large data set with multiple measurements per animal. Additionally, we highlight the potential for infrared thermography to be used for routine on-farm diagnosis of active DD lesions.

Theorizing fear of crime: beyond the rational/irrational opposition

Much has been written about the 'social problem' of fear of crime in the criminological and sociological literature in recent years. We would argue that thus far in this literature, however, there has been too much emphasis on the question 'How rational is people's fear of crime?', a question that largely reduces the complexity of the phenomenon and positions a 'biased' lay response against an 'expert' objective judgment. In this article, we review different epistemological perspectives that can be offered to understand in greater depth the fear of crime phenomenon. We place particular emphasis on those hermeneutic perspectives that go beyond the models of the rationalist, individualistic subject to exploring issues of symbolic representation, discourse and the micro - and macro-contexts in which fear of crime is experienced and given meaning. We also draw upon two case studies from our own empirical research into fear of crime, conducted with the intention of exploring the situated narratives, cultural representations and different levels of symbolic meaning that contribute to the dynamic constitution of fear.

Injuries and noncommunicable diseases: emerging health problems of children in developing countries

The present article identifies, for children living in developing countries, the major causes of ill-health that are inadequately covered by established health programmes. Injuries and noncommunicable diseases, notably asthma, epilepsy, dental caries, diabetes mellitus and rheumatic heart disease, are growing in significance. In countries where resources are scarce it is to be expected that increasing importance will be attached to the development and implementation of measures against these problems. Their control may benefit from the application of elements of programmes directed against infectious, nutritional and perinatal disorders, which continue to predominate.

Oral rehydration therapy for diarrhea: an example of reverse transfer of technology

On November 13 and 14, 1996, a scientific symposium on oral rehydration therapy (ORT) was held at the Johns Hopkins University School of Hygiene and Public Health in Baltimore, MD. The purpose of the meeting was to review the current treatment practices for the treatment of this disease in the United States. The group noted that diarrhea resulted in 300 to 400 deaths per year among children, approximately 200 000 hospitalizations, 1.5 million outpatient visits, and costs >$1 billion in direct medical costs. ORT is well established therapy for the treatment and prevention of dehydration due to diarrhea. The principles of ORT treatment include early adequate rehydration therapy using an appropriate oral rehydration solution (ORS), replacement of ongoing fluid losses from vomiting and diarrhea with ORS, and frequent feeding of appropriate foods as soon as dehydration is corrected. The effective use of ORT has saved millions of lives around the world. However, in the United States, ORT is grossly underused. Contrary to the recommendations of the American Academy of Pediatrics (AAP) and the Centers for Disease Control and Prevention (CDC), health care providers overuse intravenous hydration, prolong rehydration, delay reintroduction of feeding, and inappropriately withhold ORT, especially with children who are vomiting. The expert panel noted that the majority of deaths, hospitalization, and visits to emergency departments could be prevented by the appropriate use of ORT. They generated guidelines for the treatment and prevention of dehydration secondary to diarrhea. These measures, together with training providers, could substantially reduce diarrhea mortality and decrease hospitalizations of children by 100 000 per year in the next 5 years.

Senior school students' experiences and opinions of school-based HIV-AIDS education

This article reports the findings from the second part of a two-stage study that used both qualitative and quantitative methods to investigate the communication context of school-based HIV-AIDS education in state secondary schools in metropolitan and rural areas of New South Wales. The quantitative data are here described, focusing on a sample of 1005 Year 12 students' responses to a self-administered questionnaire. The data suggest that the students strongly supported the general idea of school-based HIV-AIDS education, but found current offerings lacking in several respects. Students identified a strong need for information about how HIV and AIDS affect the body, for more information about sexually transmissible diseases other than HIV-AIDS, for people with HIV themselves and experts in the field to provide education sessions, and for more small-group discussions. Rural students and those students from schools located in the outer western suburbs of Sydney in particular reported that they had insufficient access to the modes of information that they most preferred. There were some important differences between the responses of female and male students and between the responses of students from different ethnic groups, suggesting that these factors also need acknowledgment when school-based programs are designed for young people.

The Rex phenotype of altruistic cell death following infection of a lambda lysogen by T4rII mutants is suppressed by plasmids expressing OOP RNA

The coordinate expression from induced lambda prophages of pLit-rexB-tImm (late immunity transcription, LIT RNA) and po-oop-t(o) (OOP RNA) has remained unexplained. The initial assigned sequence for pLit bore no relationship to po. We have identified two promoter sites for independent rexB transcription, denoted here pLit2 and pLit1, which are separated by about 330 bp. The upstream pLit1 site shares with po a common 9 bp sequence between the -10 and -35 regions, with strong homology to aspects of the SOS box or LexA operator site. This sequence is also found within OOP RNA, suggesting that OOP RNA, or another regulatory factor recognizing the common sequence, was involved in the regulation of rexB expression and hence Rex exclusion. We measured the influence of OOP synthesis from plasmids on the Rex phenotype, finding that plasmids producing OOP can suppress Rex exclusion by a lambda prophage. The possibility was suggested that low level constitutive rexB transcription occurs from pLit2. Potential binding sites were identified for DnaA, for the LexA, CI and Cro repressors and for lambda O protein in the 80 nt DNA interval upstream from and including pLit1, suggesting a complex regulatory pattern for rexB expression from this promoter.

Childhood diarrhoea and acute respiratory infections in developing countries

In 1990 childhood diarrhoea and acute respiratory infections together accounted for 7.5 million deaths of children younger than five years of age in developing countries. To decrease mortality and treatment costs associated with these illnesses, the World Health Organization has developed standard diagnostic and treatment procedures for health staff, and is working on strategies for disease prevention. Immunisation against measles, adequate nutrition, including exclusive breastfeeding for the first four to six months, and improved water supplies and sanitation are the most important preventive measures. The 1990 World Summit for Children has set goals of a 50% reduction in childhood mortality from diarrhoea and a 33% reduction in mortality from acute respiratory diseases by the year 2000. These goals can be achieved by political commitment and a major investment of resources, but sustained support for these efforts from the medical professions is crucial.

Immune deposits in the skin of patients with rheumatoid arthritis

The presence of immunoglobulin and complement deposits in cutaneous blood vessels and at the dermal junction was determined in 34 patients with rheumatoid arthritis (RA). Deposits of IgM and C3 were twice as common in the leg than the arm. The deposits were present in 7/14 patients with extraarticular disease and 1/20 patients with articular disease alone. Deposits of IgM were detected at the dermoepidermal junction in 4 patients with RA. All had circulating antinuclear antibodies.