Helminths: an unrecognised disease burden prevalent among migrants in the gastroenterology clinic

Gastrointestinal parasite infections in Nepalese Gurkha recruits arriving in the United Kingdom from 2012-2020

BACKGROUND

Gastrointestinal parasite (GIP) infections are a major cause of global morbidity, infecting hundreds of millions of people each year and potentially leading to lifelong infection and serious complications. Few data exist on screening for GIP infections in migrants entering the UK or on the current performance of different traditional diagnostic approaches. This study aimed to describe the prevalence of GIP infections in Nepalese Gurkha recruits screened on arrival in the UK.

METHODOLOGY/PRINCIPAL FINDINGS

We present a retrospective analysis of data from screening male adults (18-21 years) who arrived in the UK from Nepal between 2012 and 2020. Three separate faecal samples were obtained from participants at weekly intervals and processed for formalin-ethyl acetate (FEA) concentration/light microscopy and charcoal culture. Serum samples were analysed for IgG antibodies to Strongyloides stercoralis by ELISA. Results were available from 2,263 participants, of whom 463 (20.5%, 95% CI 18.8%-22.2%) had a positive diagnostic test for at least one GIP infection. A total of 525 potential infections were identified. Giardia duodenalis was most common (231/2263, 10.2%), followed by S. stercoralis (102/2263, 4.5%), and hookworm species (86/2263, 3.8%). Analysis (microscopy and culture) of the initial stool sample diagnosed only 244/427 (57.1%) faecally identified pathogens, including 41/86 (47.7%) hookworm infections. The proportion of participants infected with any GIP showed a downward trend over the study period. Log-binomial regression showed risk of infection decreasing by 6.1% year-on-year (95% CI 3.2% - 9.0%). This was driven predominantly by a fall in hookworm, S. stercoralis and Trichuris trichiura prevalence.

CONCLUSIONS/SIGNIFICANCE

The level of potentially pathogenic GIP infection in young Nepalese men migrating to the UK is high (20.5%) and requires a combined diagnostic approach including serology and analysis of multiple stool samples incorporating specialised parasitological methods. Advances in molecular approaches may optimise and simplify the intensive screening strategy required.

Intestinal helminthic infections: a narrative review to guide the hepatogastroenterologist

Intestinal helminthic infections are not uncommon in Western Europe, mainly due to modern travel, emigration and globalization. Moreover, some helminthic infections are endemic in Western Europe and are part of the everyday clinical practice. The hepatogastroenterologist should therefore recognize and manage these patients or at least refer them to appropriate reference centers. Signs and symptoms are often unspecific or even absent. Discerning the disease at an early stage avoids expensive diagnostic testing, life-threatening complications and in some cases even further spread of the disease. This review article aims to guide the hepatogastroenterologist when suspecting a helminthic infection by addressing the most prevalent symptoms, summarizing the most probable associated helminthic entities, highlighting practical steps in diagnosis and available treatments.

Concomitant Infection of Helicobacter pylori and Intestinal Parasites in Adults Attending a Referral Centre for Parasitic Infections in North Eastern Italy

Background: Helicobacter pylori and intestinal parasites are estimated to infect with high burden worldwide. However, their concomitant infections are poorly determined in industrialized countries, such as Italy. In this study we aim at describing the presence of H. pylori as well as the proportion of coinfections with intestinal parasites among subjects who attended a referral center for tropical diseases in Northern Italy. Methods: This was a case-control study. Screening for H. pylori and parasites was performed on stool samples of 93 adults from different geographical origin (Africa, Asia, South-America, East-Europe and Italy). H. pylori infection was examined by CLIA and its cagA positivity was determined by rtPCR. Intestinal parasites (i.e., protozoa and helminths) were examined by microscopy and rtPCR. Results: Sixty-one out of 93 patients (66%) were positive to H. pylori and 31 (33%) were cagA+. Among H. pylori positives, 45 (74%) had a concomitant infection. The coinfection H. pylori–Blastocystis was the most frequent one, followed by H. pylori–E. coli. Multivariable logistic regression showed that positivity to H. pylori was associated with having a coinfection. Conclusion: Our data suggested that H. pylori and intestinal parasitic infections are fairly common in subjects who attended a referral center for tropical diseases in Northern Italy. The high rate of H. pylori infection, and especially the positivity to the virulent cagA+, should be taken into consideration in subjects undergoing screening for parasitic infections.

Screening for infection in unaccompanied asylum-seeking children and young people

We aimed to evaluate a screening programme for infection in unaccompanied asylum seeking children and young people against national guidance and to described the rates of identified infection in the cohort. The audit was conducted by retrospective case note review of routinely collected, anonymised patient data from all UASC referred between January 2016 and December 2018 in two paediatric infectious diseases clinics.There were 252 individuals from 19 countries included in the study, of these 88% were male, and the median age was 17 years (range 11-18). Individuals from Afghanistan, Eritrea and Albania constituted the majority of those seen. Median time between arriving in the UK and infection screening was 6 months (IQR 4-10 months, data available on 197 UASC). There were 94% (238/252) of cases tested for tuberculosis (TB), of whom 23% (55/238) were positive, including three young people with TB disease. Of those tested for hepatitis B, 4.8% (10/210) were positive, 0.5% (1/121) were positive for hepatitis C and of 252 tested, none were positive for HIV. Of the 163 individuals who were tested for schistosomiasis, 27 were positive (16%).The majority of patients were appropriately tested for infections with a high rate of identification of treatable asymptomatic infection. Infections were of both individual and public health significance. Our findings of clinically significant rates of treatable infections in UASC highlight the importance of infection screening for all in this vulnerable patient group.