Is pityriasis rosea dying?

Worldwide Evolution of Vaccinable and Nonvaccinable Viral Skin Infections: Google Trends Analysis

BACKGROUND

Most common viral skin infections are not reportable conditions. Studying the population dynamics of these viral epidemics using traditional field methods is costly and time-consuming, especially over wide geographical areas.

OBJECTIVE

This study aimed to explore the evolution, seasonality, and distribution of vaccinable and nonvaccinable viral skin infections through an analysis of Google Trends.

METHODS

Worldwide search trends from January 2004 through May 2021 for viral skin infections were extracted from Google Trends, quantified, and analyzed.

RESULTS

Time series decomposition showed that the total search term volume for warts; zoster; roseola; measles; hand, foot, and mouth disease (HFMD); varicella; and rubella increased worldwide over the study period, whereas the interest for Pityriasis rosea and herpes simplex decreased. Internet searches for HFMD, varicella, and measles exhibited the highest seasonal patterns. The interest for measles and rubella was more pronounced in African countries, whereas the interest for HFMD and roseola was more pronounced in East Asia.

CONCLUSIONS

Harnessing data generated by web searches may increase the efficacy of traditional surveillance systems and strengthens the suspicion that the incidence of some vaccinable viral skin infections such as varicella, measles, and rubella may be globally increasing, whereas the incidence of common nonvaccinable skin infections remains stable.

An epidemiological study of pityriasis rosea in the Eastern Anatolia

The purpose of this study was to investigate the epidemiological features of pityriasis rosea (PR) in the Eastern Anatolia, Turkey. Three hundred ninety-one patients (214 females, 177 males) with PR seen during the years 1992-1995 were analyzed for annual incidence among dermatologic outpatients, sex, age, and distribution by month and year. The average annual incidence was 0.75 per 100 dermatologic patients. PR was reported to be slightly more common in women by margin of 1.2:1.0. Eighty-seven percent of the cases were between the ages of 10 and 39 years, with a peak in the 20-29 age group. The incidence of the disease was much higher in the rainy and snowy months. No declining incidence was observed over the years. Changes in incidence from year to year, though not great, were statistically significant.

Pityriasis rosea in Lagos

A recent 5-year period study of the incidence of pityriasis rosea among dermatologic outpatients was conducted at the Lagos University Teaching Hospital. Three hundred fifty-two patients with pityriasis rosea were seen. The average annual incidence was 4.8 per 100 dermatologic patients. Women predominated by a margin of 1.2:1.0. More than 91% of the patients were between the ages of 5 and 35 years, with a peak at ages 10-14. The incidence of the disease was significantly higher in the early part of the rainy season. No declining incidence was observed over the years. A blood picture of a leukopenia with relative lymphocytosis was observed early in the disease. Ampicillin, when consumed after the onset of the eruption, made the patient with pityriasis rosea clinically worse.