A systematic review of tuberculosis detection and prevention studies in prisons

Assessment of tuberculosis transmission probability in three Thai prisons based on five dynamic models

This study aimed to assess and compare the probability of tuberculosis (TB) transmission based on five dynamic models: the Wells-Riley equation, two Rudnick & Milton-proposed models based on air changes per hour (ACH) and liters per second per person (L/s/p), the model proposed by Issarow et al, and the Applied Susceptible-Exposed-Infected-Recovered (SEIR) TB transmission model. This study also aimed to determine the impact of model parameters on such probabilities in three Thai prisons. A cross-sectional study was conducted using data from 985 prison cells. The TB transmission probability for each cell was calculated using parameters relevant to the specific model formula, and the magnitude of the model agreement was examined by Spearman's rank correlation and Bland-Altman plot. Subsequently, a multiple linear regression analysis was conducted to investigate the influence of each model parameter on the estimated probability. Results revealed that the median (Quartiles 1 and 3) of TB transmission probability among these cells was 0.052 (0.017, 0.180). Compared with the pioneered Wells-Riley's model, the remaining models projected discrepant TB transmission probability from less to more commensurate to the degree of model modification from the pioneered model as follows: Rudnick & Milton (ACH), Issarow et al., and Rudnick & Milton (L/s/p), and the applied SEIR models. The ventilation rate and number of infectious TB patients in each cell or zone had the greatest impact on the estimated TB transmission probability in most models. Additionally, the number of inmates in each cell, the area per person in square meters, and the inmate turnover rate were identified as high-impact parameters in the applied SEIR model. All stakeholders must urgently address these influential parameters to reduce TB transmission in prisons. Moreover, further studies are required to determine their relative validity in accurately predicting TB incidence in prison settings.

Who Transmits Tuberculosis to Whom: A Cross-Sectional Analysis of a Cohort Study in Lima, Peru

Rationale: The persistent burden of tuberculosis (TB) disease emphasizes the need to identify individuals with TB for treatment and those at a high risk of incident TB for prevention. Targeting interventions toward those at high risk of developing and transmitting TB is a public health priority. Objectives: We aimed to identify characteristics of individuals involved in TB transmission in a community setting, which may guide the prioritization of targeted interventions. Methods: We collected clinical and sociodemographic data from a cohort of patients with TB in Lima, Peru. We used whole-genome sequencing data to assess the genetic distance between all possible pairs of patients; we considered pairs to be the result of a direct transmission event if they differed by three or fewer SNPs, and we assumed that the first diagnosed patient in a pair was the transmitter and the second was the recipient. We used logistic regression to examine the association between host factors and the likelihood of direct TB transmission. Measurements and Main Results: Analyzing data from 2,518 index patients with TB, we identified 1,447 direct transmission pairs. Regardless of recipient attributes, individuals less than 34 years old, males, and those with a history of incarceration had a higher likelihood of being transmitters in direct transmission pairs. Direct transmission was more likely when both patients were drinkers or smokers. Conclusions: This study identifies men, young adults, former prisoners, alcohol consumers, and smokers as priority groups for targeted interventions. Innovative strategies are needed to extend TB screening to social groups such as young adults and prisoners with limited access to routine preventive care.

Not Only COVID-19: Prevalence and Management of Latent Mycobacterium Tuberculosis Infection in Three Penitentiary Facilities in Southern Italy

Latent Mycobacterium tuberculosis infection (LTBI) and active tuberculosis in prisoners are higher than the general population and are two public health concerns, especially in low- and middle-income countries. We conducted a cross-sectional study to determine the prevalence and the factors associated with LTBI among the inmate population detained in three Southern Italian penitentiaries. Tuberculin intradermal reaction skin test was performed on the inmates who agreed to participate in the study. In case of positivity, the QuantiFERON-TB test was performed. In those positive to QuantiFERON, chest X-ray films were performed, and treatment initiated. A total of 381 inmates accepted to participate. The prevalence of LTBI was 4.2%. In the analysis, LTBI was associated with no self-reported contact with active tuberculosis patients within the prisons, and 10% of subjects admitted the use of inhaled drugs. No HIV coinfections were found. No cases of active symptomatic tuberculosis were identified during the study period. Our results confirm that incarceration increases the risk of tuberculous infection. Non-EU nationality and a history of drug addiction appear to be major risk factors for tuberculosis infection in the penitentiary setting. Reinforcing tuberculosis control is essential to prevent its transmission in prisons.

Sexually transmitted infections epidemiology and risk assessment at the main correctional facility in Malta (2017-2019)

BACKGROUND

Inmates suffer from mental and physical ailments combined with substance misuse and addiction which are often underreported or disregarded by sufferers, for fear of being stigmatized. This vulnerable group has complex medical and psychosocial needs and hence gathering data is essential for a holistic approach to care.

OBJECTIVES

Understanding the interplay between sexually transmitted (STIs) and blood borne infections, substance misuse and mental health is essential to enable targeted interventions and outreach programmes. The aim was to analyse the occurrence of STIs, hepatitis and tuberculosis in inmates at the main custodial facility in Malta; to assess risk behaviours and vulnerabilities through an outreach programme; to offer treatment and referral and to develop recommendations for screening of prison inmates.

METHODS

A mixed methodology study was used which involved analysis of health data pooled from the Genitourinary Clinic (GUC) and Corradino Correctional Facility (CCF) in Malta.

RESULTS

In the study period, 206 inmates were tested for STIs, 67.9% males, aged between 14 and 72. Only 27% were not sexually active in the 6 months prior to testing. Among those sexually active, 31% had had sex with casual partners and 43% had never used condoms for sexual intercourse. Seventy-five percent admitted to drug use. The most common STI diagnosed was HPV (16.5%), followed by syphilis (5.8%). Genital dermatoses were also frequent (9.2%). The prevalence of Hepatitis C was high (24.5%), in relation to intravenous drug use.

CONCLUSION

The authors advocate for more collaboration between sexual health clinics and prisons to address educational interventions and STIs' testing. Cultural and linguistic barriers should be considered when devising national health strategies and screening recommendations in custodial settings. Adequate follow-up should extend into the community setting once inmates leave the prison to ensure a continuum of care.