Cyclospora cayetanensis is a parasite that causes intestinal disease that can be especially severe in immunocompromised patients. Most cases occur in tropical and subtropical areas, and in industrialized countries their diagnosis is mostly linked to international travel or the ingestion of imported food. We describe this case of severe diarrhoea in a patient with diffuse large B cell lymphoma and no epidemiological risk factors that was successfully treated with trimethoprim–sulfamethoxazole (TMP–STX). C. cayetanensis is a pathogen that should be taken into account in patients with chronic diarrhoea, especially immunocompromised patients, even when no epidemiological risk factors are present.

The management of Mycoplasma genitalium sexually transmitted infection (STI) is hindered by increasing resistance to the recommended antibiotics, macrolides and quinolones, worldwide. In Gipuzkoa (Basque Country, Spain), macrolide and quinolone resistance rates in 2014–2018 were reported as <20% and <10%, respectively. The aims of this study were to compare these rates with those in 2019–2021 and analyse the genetic and epidemiological features of the strains and cases associated with striking changes in the resistance trends. Resistance to macrolides (n = 1019) and quinolones (n = 958) was studied, analysing mutations in 23S rRNA and parC/gyrA genes, respectively. The rate of macrolide resistance increased from 17.3% in 2014–2018 to 32.1% in 2019–2021, as much in the more prevalent A2058/2059G mutations (16.6–27.8%) as in the emergent A2058T mutations (0.5–4.1%) but with differences in the odds ratios and the relative risk increase between A2058T and A2058/2059G mutations. MG191 adhesin and MG309 lipoprotein of the 27 emergent strains detected with A2058T mutations were amplified, sequenced, and typed using phylogenetic and variable number tandem repeat analysis, respectively. Genetic clonal spread was ruled out, but most of the A2058T cases were men who had sex with men (24/27) with a history of STI and antibiotic treatments (19/27). No changes were observed in quinolone resistance trends, but the rate of resistance to both antibiotics rose from 2.9% to 8.3%, especially in cases with A2058T mutations. The genetic characterisation of strains and epidemiological surveillance of cases are needed to detect populations at increased risk of treatment failure in this infection.

To assess a screening program for sexually transmitted infections (STIs) in under-30-year-old pregnant women, focusing on Chlamydia trachomatis, Neisseria gonorrhoeae and Mycoplasma genitalium infections, which though often asymptomatic, may significantly affect women's health and can be vertically transmitted. Design: Prospective, descriptive, observational study. Setting: Gipuzkoa (Basque Country, Spain). Population: Under-30-year-old pregnant women. Methods: Between 2016 and 2020, cervical samples were taken at first prenatal appointments from 3051 women. STIs were detected by multiplex nucleic acid amplification. Main Outcome Measures: Prevalence of infections by age and geographical origin groups, and screening coverage. Results: The coverage rate was 86% between 2017 and 2020. At least one STI was detected in 5.2% of the under-30-year-olds screened (95% confidence interval [CI]: 4.5%, 6.1%): C. trachomatis in 4%, M. genitalium in 1.3% and N. gonorrhoeae in 0.1%. C. trachomatis and M. genitalium prevalence rates were higher among younger women (7.2% and 2.8%, respectively in under-25-year-olds), while C. trachomatis prevalence in 25-to 30-year-olds was 2.5%. C. trachomatis was more common among Latin American women (9.7% [95% CI: 7.4%, 12.3%] vs. 2.5% [95% CI: 2.0%, 3.2%] in other women). Additionally, analysing samples from 708 pregnant over-30-year-old women with STI risk factors, 1.6% had at least one of the STIs studied. Notably, 20% of all cases had STI-related symptoms or complications during pregnancy. Conclusions: The high coverage achieved, and prevalence, clinical and epidemiological results support the view that the implementation of a screening program across Spain for C. trachomatis in under-30-year-old pregnant women would be both feasible and appropriate.

Chlamydia trachomatis infection is an important public health problem. Our objective was to assess the dynamics of the transmission of this infection, analysing the distribution of circulating ompA genotypes and multilocus sequence types of C. trachomatis in Spain as a function of clinical and epidemiological variables. During 2018 and 2019, we genetically characterized C. trachomatis in tertiary hospitals in six areas in Spain (Asturias, Barcelona, Gipuzkoa, Mallorca, Seville and Zaragoza), with a catchment population of 3.050 million people. Genotypes and sequence types were obtained using polymerase chain reaction techniques that amplify a fragment of the ompA gene, and five highly variable genes (hctB, CT058, CT144, CT172 and pbpB), respectively. Amplicons were sequenced and phylogenetic analysis was conducted. We obtained genotypes in 636/698 cases (91.1%). Overall and by area, genotype E was the most common (35%). Stratifying by sex, genotypes D and G were more common among men, and genotypes F and I among women (p < 0.05). Genotypes D, G and J were more common in men who have sex with men (MSM) than in men who have sex with women (MSW), in whom the most common genotypes were E and F. The diversity index was higher in sequence typing (0.981) than in genotyping (0.791), and the most common sequence types were ST52 and ST108 in MSM, and ST30, ST148, ST276 and ST327 in MSW. Differences in genotype distribution between geographical areas were attributable to differences in population characteristics. The transmission dynamics varied with sexual behaviour: the predominant genotypes and most frequent sequence types found in MSM were different to those detected in MSW and women.