The community screening outreach project was organized by KCS, in collaboration with several community organizations, including the United Sikhs. United Sikhs is a U.N.-affiliated human development and advocacy organization that aims to empower disadvantaged minority communities worldwide. KCS partnered with the Center for Viral Hepatitis (CVH), a non-profit organization devoted to promoting CHB screening and linkage to care in the Asian American community.

Between April 2022 and January 2024, hepatitis B screening and education activities were carried out at 19 community screening events at various locations throughout Queens, NY. A total of 328 Indian Americans were screened with blood tests. The sample size was determined based on the voluntary participation of community members, and study investigators did not influence their decision. All of the HBV-infected participants were referred to healthcare providers (HCPs) in the community, and those who were not immune were referred to community healthcare facilities or HCPs for vaccination.

All the participants were immigrants from India living in Queens or other parts of New York State. Their ages ranged from 20 to 80, with a mean age of 53. The vast majority of the participants reported having lived in the United States for at least ten years. More than 95% of the participants preferred Punjabi and Hindi to English for communication.

Phlebotomists or registered nurses conducted the blood drawing and processing, and physicians reviewed all the results of the triple panel test. All the participants who had screening tests were contacted by telephone, email, and stamped mail. For instance, the participants who did not respond were tracked down and were successfully contacted through telephone calls and certified mail.

A self-administered survey questionnaire was employed to evaluate demographic characteristics and information on the participants’ history of infection. At the time of the screening, participants completed a survey written in English, Punjabi, and Hindi, translated by individuals fluent in the pertinent language. The survey questionnaire was designed by the authors and has been utilized in our previous studies. Our survey has proven reliable and valid through previous studies over the past decade [29] [30] [31] . All participants provided written informed consent. The participants’ demographic information, including sex, age, place of birth, and length of residence in the United States, was collected. They were asked the following survey questions: 1) Have you ever had a Hepatitis B screening? 2) Have you received a Hep-B vaccination before? 3) Are you currently infected with Hepatitis B virus? If yes, when were you first diagnosed? 4) Have you consulted a physician for hepatitis B care? 5) Are you currently taking antiviral medication? In this study, LTC was defined as at least one visit to a provider for hepatitis B care.

All the data were anonymized before they were reviewed and analyzed. Analysis was performed to compute the numbers, percentages, and means. Exact binomial 95% confidence intervals (CIs) were calculated for the prevalence of HBsAg seropositivity, immune, and non-immune rates.

Over a series of 19 screening events, 10 to 25 participants were screened at each. The age and sex distribution of the 328 participants are presented in Table 1. The mean age of the participants was 53 years; 75% were males. We divided the age groups into three categories: 20 - 40 (20%), 41 - 60 (44%), and 61 - 80 (36%).

Of 328 participants, 10 (3.0%) were infected with HBV, 96 (29.3%) were immune, and 222 (67.7%) were susceptible to HBV infection (Table 2).

The prevalence of HBV infection varied among different age groups (Table 3). Additionally, males had a higher rate of HBsAg (3.23%) than females (2.38%).

Of 328 participants screened, 96 were immune, a 29.3% immunity rate (Table 4). We looked into the acquisition of immunity from vaccination versus past infection. Of the 96 immune participants, 52 developed immunity from vaccination and 44 from past infection. Notably, 5 of those 44 participants “recovered” from past infection were only HBcAb positive from the three-panel test, indicating isolated hepatitis B core antibody (anti-HBc).

The ratio of acquiring immunity from vaccination to acquiring immunity from past infection varied in different age groups. Most of the immunity came from vaccination in younger age groups (age 21 - 40), while the immunity came equally from previous infection and vaccination in older age groups (age 41 - 80).

Despite the availability of vaccines for some four decades now, many subjects were still not immune to HBV. Of 328 screened in this study, 222 participants (67.7%) lacked protective antibodies to HBV (Table 2). This lack of immunity was apparent in all age groups (Table 4).

Of ten individuals infected with HBV, only two knew that they had been infected, but neither was following up with an HCP. The remaining eight people found out for the first time, through this study, that they were infected. Unfortunately, none of these HBV-infected individuals was receiving any medical care, which reflects the poor LTC in the Indian American community evaluated in this study.

In the study population, the immune rate was only 29.3%, and those who had developed protective antibodies from past infection were only 13.6%. Five participants from this “recovered” group had isolated anti-HBc (Table 4). Although isolated anti-HBc may indicate an undetectable level of HbsAg, it is more likely to represent a remote infection with a waning titer of HBsAb without viremia. The prevalence of isolated anti-HBc can increase with age, reaching up to 12% in endemic populations [29] [35] .

Of the total immune rate of 29.3%, those who had developed protective antibodies from vaccination were only 15.9%. The HB vaccination rate in Indian Americans is significantly lower than the 27% - 30% HB vaccination rate in Korean and Chinese Americans [30] [31] . A recent report has shown that Indian Americans have a higher vaccination rate. However, this study was based on the National Health Interview Survey, which does not reflect whether those who received vaccines became immune as a direct result of vaccination [36] . Many of those who received vaccination may have had past infections, as vaccines were not administered after screening. If that occurred, it could overestimate the immunity from vaccination. Although our sample size is small, the vaccination rate obtained reflects those who have developed immunity from vaccination. The low HB vaccination rate from the current study may not be far off from the HB vaccination rate in India. While national data on adult HB vaccination in India are not available, the proportion of children with evidence of HB vaccination was highest in the southern region of the country (31.2%) and lowest in the northern (12.1%) and western (12.1%) regions. Overall, children residing in urban areas (20.6%) had a higher prevalence of anti-HBs on account of HB vaccination than those residing in rural areas (14.7%), suggesting that vaccination in rural areas lags behind those in cities [37] . In addition, 67.7% of the participants in the current study were at risk for infection. This high percentage of the at-risk population is also reflected in studies from India [37] . Given India’s large population, these data suggest the country may have a huge reservoir of infection there.

India introduced national-scale HB vaccination relatively late compared to many developed countries. HB vaccine started in India’s Universal Immunization Program on a pilot basis in 14 cities and 33 districts in 2002-2003, expanded to 10 states in 2007-2008 (Phase 1) and the entire country in 2011-2012 (Phase 2) [38] . Consequently, only a few extensive Indian studies are available, reporting the impact of HB vaccination in a limited geographical area [39] [40] . Thus, there is a lack of national data on the impact of introducing the hepatitis B vaccine in India, indicating the need for a serological survey representative of the entire nation [37] [40] .

Despite the small sample size, the current study reveals provocative observations about the HBV status of the Indian American community. It raises crucial points regarding how we may approach multi-ethnic populations in the US with significant HBV reservoirs of infection towards the goal of eliminating HB in the following decades.

Most importantly, this study is the first report on the prevalence of HBV among Indian immigrants in the US. Hence, no other studies are available for comparison. Given the high population of Indian immigrants with HBV prevalence of 2% - 4%, it is striking that there have been no prior studies of screening and LTC in this population at moderate risk. This pilot study calls for an urgent and more extensive evaluation of HBV prevalence in the Indian American community. The community outreach approaches are crucial and have been successful in some other Asian American communities. For example, in the Korean American and Chinese American populations, there have been many community-based efforts that generated positive impacts in reducing the HBV burden in the same communities [30] [31] [41] .

Another noteworthy aspect of this study is the demonstration that most of the HBV-infected subjects found in the current study had been diagnosed for the first time. This is not unexpected since more than 95% of the participants had never been screened for HBV. The poor LTC of the HBV-infected and the high proportion of participants susceptible to infection suggest a severe lack of screening and education. Especially given the projected increase in the Indian immigrant population in the US [27] [28] , the need for HB screening and education for the same population is rather urgent.

Other studies in Asian American communities have also reported a significant lack of LTC [30] [31] [42] . The challenges to furnishing LTC are most often related to finding qualified health professionals within the community, who can provide care in a linguistically and culturally sensitive manner. Improvements in patient education, counseling, and navigation efforts may also be an effective strategy to improve linkages from community-based testing sites to HBV-directed medical care. Because routine and ongoing monitoring is the foundation for effective HBV medical management, future efforts to improve outcomes among HBV-infected people should provide a greater emphasis on LTC.

It is important to note that there are several limitations to consider in this study. Firstly, the participants of the study, who were Indian American residents of Queens, NY, may not be representative of the entire Indian population in the United States. Secondly, the study’s sample size is small, so we must be cautious when drawing conclusions from the results. Additionally, education level, income, and insurance status are important factors that can affect the prevalence of HBV, but it is unknown how these and other socioeconomic factors may have influenced the results of this study. Subjects’ willingness to be screened can also vary widely. Thirdly, the sex and age distributions of the study population are not evenly distributed and may not represent the entire population. For example, the study may underrepresent younger age groups (age 21 - 40) relative to the older age groups. Finally, it is possible that differences in the screening settings could have affected the prevalence. The non-clinical community settings used in this study for screening may differ in pertinent respects from the hospital or academic settings.