Vertigo is a frequent symptom in the general population with a 12-month prevalence of 5% and an incidence of 1.4% in adults. Its prevalence rises with age and is about two to three times higher in women than in men. The epidemiology of vertigo and underlying specific vestibular disorders is still an underdeveloped field despite its usefulness for clinical decision making and its potential for i...

Disasters present a unique challenge for the epidemiologic research community. Disasters are almost always unexpected and their aftermath is typically characterized by a strain on existing infrastructure and resources. These are not the conditions under which the epidemiologic research community typically thrives. However, disasters by definition affect large numbers of people and a growing bod...

Though appendicitis is common many important questions remain unanswered. When is the appendix normal and when is it the cause of abdominal pain? Why does appendicitis primarily affect older children and young adults? Why is appendicitis uncommon in those under five years of age and in those over sixty years of age? Why are boys affected more often than girls? Why does appendicitis appear to ru...

What is the distribution and population density of ticks transmitting the Lyme spirochete? Data on tick distribution are scarce. Ixodes dammini appears to be limited to sea-level ecosystems, whereas L pacificus populations are adequate up to 7,000 feet elevation. Three cases of Lyme disease had their exposure above 5,000 feet in the Sierras of northern California. The nymphal tick is very small...

Introduction: Actinic keratoses (AK) are preneoplastic lesions secondary to chronic sun exposure, whose risk of becoming malignancy is greater than 20%. Prevalence studies AK uncommon. Here we describe clinical and epidemiologic characteristics patients with assessed in a dermatology center from Bogota, Colombia.

In the NIH Collaborative Perinatal Project, a prospective study of over 53,000 pregnant women and their offspring, 71 single-born children (13.33/10,000) were found to have a non-syndromal neural tube defect (NTD). A family history was present in only one case. The group of individuals with NTD was compared to a group of 400 randomly selected non-malformed control infants. Of over 50 maternal f...

Airborne transmission through infectious droplet nuclei Characteristics of an infectious patient Air circulation and ventilation Reducing expulsion of infectious material from source cases Host immune response Other modes of transmission: M. bovis Evaluation of the sensitivity of the tuberculin skin test Problems with the specificity of the tuberculin skin test in veterinary medicine Standardiz...