Abstract
What’s already identified about this subject?
Throughout 2013, protection with the primary dose of rubella-containing vaccine (RCV1) within the World Well being Group South-East Asia Area was 12%, and solely 5 international locations within the area had launched RCV into their routine immunization packages.
What’s added by this report?
By 2021, all 11 SEAR international locations had launched RCV1, and estimated regional RCV1 protection elevated from 12% to 86%; rubella incidence declined by 80%. Maldives and Sri Lanka achieved rubella elimination; Bhutan, North Korea, and Timor-Leste have halted endemic transmission of rubella virus for >36 months.
What are the implications for public well being observe?
SEAR has made substantial progress towards rubella elimination. To attain regional rubella elimination by 2023, optimum and accelerated measures to implement all elimination methods are wanted.
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Throughout 2013, the 11 international locations of the World Well being Group (WHO) South-East Asia Area* (SEAR) adopted the targets of measles elimination and rubella and congenital rubella syndrome (CRS) management† by 2020. Throughout 2019, SEAR international locations declared a broader objective for eliminating each measles and rubella§ by 2023 (1). Earlier than 2013, solely 5 SEAR international locations had launched rubella-containing vaccine (RCV). This report updates a earlier report and describes progress towards rubella elimination in SEAR throughout 2013–2021 (2). Throughout 2013–2021, six SEAR international locations launched RCV; all international locations within the Area now use RCV in routine immunization. Routine immunization protection with the primary dose of a rubella-containing vaccine (RCV1) elevated >600%, from 12% throughout 2013 to 86% throughout 2021, and an estimated 515 million individuals have been vaccinated by way of RCV supplementary immunization actions (SIAs)¶ throughout 2013–2021. Throughout this time, annual reported rubella incidence declined by 80%, from 5.5 to 1.1 circumstances per million inhabitants. Maldives and Sri Lanka are verified as having achieved rubella elimination; Bhutan, North Korea, and Timor-Leste have halted endemic transmission of rubella virus for >36 months. SEAR has made substantial progress towards rubella elimination; nevertheless, intensified measures are wanted to realize elimination.
Rubella is the main reason for vaccine-preventable start defects (3). Rubella an infection throughout being pregnant, particularly through the first trimester, can lead to miscarriage, fetal demise, or CRS, a constellation of congenital malformations, ceaselessly together with visible, auditory, or cardiac defects. CRS is a reason for mortality amongst infants and youngsters and a shortened lifespan amongst adults. Rubella and measles elimination actions are programmatically linked as a result of RCV is run as a mixed measles and rubella vaccine, and rubella circumstances are detected by way of case-based surveillance for measles or fever and rash sickness (4). The WHO SEAR-recommended methods (5) to realize rubella elimination embrace 1) attaining and sustaining ≥95% protection with 2 doses of measles- and rubella-containing vaccine in each district by way of routine immunization or SIAs; 2) creating and sustaining a delicate and well timed case-based surveillance system for rubella and sentinel website surveillance for CRS that meets beneficial efficiency indicators**; 3) creating and sustaining an accredited laboratory community; 4) attaining well timed identification, investigation, and response to rubella outbreaks; and 5) linking with different public well being initiatives to realize the primary 4 methods.
Immunization Actions
RCV1 was launched in 5 SEAR international locations (Bangladesh, Bhutan, Maldives, Sri Lanka, and Thailand) earlier than 2013 and within the remaining six SEAR international locations (Burma [Myanmar],†† India, Indonesia, Nepal, North Korea, and Timor-Leste) throughout 2013–2019. A routine second RCV dose (RCV2) was launched in three international locations (Bhutan, Sri Lanka, and Thailand) earlier than 2013 and within the remaining eight throughout 2013–2021 (Desk 1).
WHO and UNICEF estimated that regional RCV1 protection elevated from 12% throughout 2013 to 86% throughout 2021 (6) (Determine); 5 international locations reported ≥95% RCV1 protection throughout 2021 (Desk 1). The very best regional RCV1 protection (93%) was achieved throughout 2019, simply earlier than the beginning of the COVID-19 pandemic. Throughout 2013–2021, SIAs with RCV have been performed in 10 SEAR international locations (all besides Sri Lanka) and reached greater than 514 million individuals.§§
Surveillance Actions
By 2021, case-based measles and rubella surveillance with laboratory affirmation of suspected circumstances¶¶ was applied in all international locations within the area. As an integral part of the WHO International Measles and Rubella Laboratory Community, a measles-rubella laboratory community was established within the area by 2003, and by 2021, the regional laboratory community included 58 proficient laboratories*** with one regional reference laboratory in Thailand; all international locations had at the least one proficient laboratory. Throughout 2013, two of the 11 international locations achieved the sensitivity indicator goal of two or extra discarded nonmeasles, nonrubella circumstances per 100,000 inhabitants, and the regional discarded case charge was 0.91; this elevated to 1.52 throughout 2021. Nevertheless, throughout 2021, solely 5 international locations achieved the goal discarded case charge of two or extra per 100,000 inhabitants (Desk 2).
All international locations in SEAR have established CRS surveillance. North Korea, Sri Lanka, and Thailand report CRS circumstances as a part of their nationwide built-in illness surveillance packages. The remaining eight international locations establish CRS circumstances by way of sentinel website surveillance. The variety of SEAR international locations reporting CRS circumstances by way of the WHO-UNICEF Joint Reporting Kind elevated from six throughout 2013 to seven throughout 2021 (Desk 1).
Rubella and CRS Incidence and Rubella Virus Genotypes
Throughout 2013–2021, the variety of reported††† rubella circumstances within the area decreased by 80%, from 10,434 to 2,103 (Determine). Annual rubella incidence additionally declined by 80%, from 5.5 to 1.1 circumstances per 1 million inhabitants (Desk 1). The variety of reported CRS circumstances elevated from 23 to 401, probably due to institution or enhancement of CRS surveillance in a number of SEAR international locations.
Throughout 2013–2021, rubella virus genotypes detected in affected person isolates within the area included 2B in India and Thailand, with endemic 1E in Thailand, and 1J in India. Nevertheless, the variety of specimens collected and examined for genotyping was low, limiting interpretation about transmission.
Regional Verification of Rubella Management and Elimination
The WHO South-East Asia Regional Verification Fee (RVC) for measles and rubella elimination was established throughout 2016 and developed an up to date framework for verification of measles and rubella elimination throughout 2020 (7). Nationwide verification committees have been established in all 11 international locations, offering annual studies on progress towards measles and rubella elimination to the RVC. As of 2021, the RVC has verified rubella elimination in Maldives (2020) and Sri Lanka (2020). As well as, three international locations (Bhutan, North Korea, and Timor-Leste) have halted endemic transmission of rubella for >36 months and have been awaiting verification of elimination (8).
Dialogue
Throughout 2013–2021, substantial progress was made towards rubella elimination in WHO SEAR. Via the implementation of the regional methods, estimated RCV1 protection elevated by >600%, and reported rubella incidence declined by 80%. The rise within the variety of reported CRS circumstances throughout 2013–2021 probably displays improved surveillance within the international locations that initiated CRS surveillance after 2013, fairly than a rise in rubella amongst inclined pregnant girls and CRS of their infants (3). By the tip of 2021, two of the 11 international locations had been verified as having eradicated endemic rubella transmission. As of Could 2023, an extra three international locations with interrupted rubella virus transmission for >36 months are awaiting verification of elimination.
Regardless of these successes, challenges to attaining rubella elimination in SEAR exist. Throughout the COVID-19 pandemic, routine RCV1 protection within the area declined from 93% throughout 2019 to 86% throughout 2021. Throughout 2021, among the many estimated 25 million infants who didn’t obtain RCV1 worldwide, roughly 18% lived in SEAR, together with 2.4 million in India and 1.2 million in Indonesia (9). As well as, rubella surveillance actions have been affected by the pandemic, probably associated to COVID-19 mitigation measures (e.g., bodily distancing or masking) that decreased transmission of rubella and different respiratory viruses, along with declines in clinic visits for febrile rash sickness due to motion restrictions imposed nationally, and the deployment of surveillance personnel to pandemic response actions. A current impartial evaluate of progress towards measles and rubella elimination in SEAR concluded that a number of challenges, together with immunity gaps, suboptimal surveillance sensitivity, insufficient outbreak response and preparedness, funding gaps, and the unfavourable results of the COVID-19 pandemic on immunization packages threatened the achievement of the 2023 goal (10).
The findings on this report are topic to at the least three limitations. First, protection estimates are primarily based on administrative knowledge and is likely to be inaccurate due to errors in recording doses administered or in estimates of the goal populations. Second, surveillance knowledge may underestimate true illness incidence as a result of not all rubella infections trigger fever, not all sufferers search care, and never all rubella circumstances in sufferers who search care are reported. As well as, not all international locations are persistently reporting CRS circumstances by way of the Joint Reporting Kind. Lastly, genotype knowledge are primarily based on a restricted and nonrepresentative variety of sequences and don’t essentially replicate the predominant genotypes within the area.
Reaching rubella elimination in WHO-SEAR by 2023 would require pressing, intensified measures by international locations to implement methods in a really quick time. The resetting of a brand new goal date represents a possibility to impress actions and keep momentum within the area to 1) acquire the best stage of nationwide dedication from SEAR international locations and help from companions; 2) strengthen routine immunization and obtain ≥95% protection with RCV1; 3) conduct high-quality SIAs; 4) improve surveillance sensitivity and improve assortment of specimens for rubella virus detection and genotyping; and 5) leverage elimination actions to boost measures to revive routine immunization companies and scale back immunity gaps for all vaccine-preventable illnesses. With the regional start cohort representing 24% of the world’s infants surviving past age 1 12 months, progress towards rubella elimination in SEAR represents an essential alternative to lower rubella-related demise, incapacity, and sickness worldwide.
Acknowledgments
Immunization and surveillance program workers members from SEAR international locations, together with businesses represented within the Measles and Rubella Partnership.
1Immunizations and Vaccines Growth, World Well being Group South-East Asia Regional Workplace, New Delhi, India; 2Immunization, Vaccines and Biologicals, World Well being Group, Geneva, Switzerland; 3International Immunization Division, International Well being Heart, CDC.
References
- Regional Workplace for South-East Asia. Measles and rubella elimination by 2023. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2019. https://apps.who.int/iris/bitstream/deal with/10665/327923/sea-rc72-r3-eng.pdf?sequence=1&isAllowed=y
- Khanal S, Bahl S, Sharifuzzaman M, et al. Progress towards rubella and congenital rubella syndrome management—South-East Asia Area, 2000–2016. MMWR Morb Mortal Wkly Rep 2018;67:602–6. https://doi.org/10.15585/mmwr.mm6721a3 PMID:21854983
- Zimmerman LA, Knapp JK, Antoni S, Grant GB, Reef SE. Progress towards rubella and congenital rubella syndrome management and elimination—worldwide, 2012–2020. MMWR Morb Mortal Wkly Rep 2022;71:196–201. https://doi.org/10.15585/mmwr.mm7106a2 PMID:35143468
- Regional Workplace for South-East Asia. Surveillance information for vaccine-preventable illnesses in WHO South-East Asia Area. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2017. https://apps.who.int/iris/deal with/10665/277459
- Regional Workplace for South-East Asia. Strategic plan for measles and rubella elimination in WHO South-East Asia Area: 2020–2024. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2019. https://apps.who.int/iris/deal with/10665/330356
- Burton A, Monasch R, Lautenbach B, et al. WHO and UNICEF estimates of nationwide toddler immunization protection: strategies and processes. Bull WHO 2009;87:535–41. https://doi.org/10.2471/BLT.08.053819 PMID:19649368
- Regional Workplace for South-East Asia. Framework for verification of measles and rubella elimination within the WHO South-East Asia Area. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2020. https://apps.who.int/iris/deal with/10665/332737
- Regional Workplace for South-East Asia. Seventh assembly of the WHO South-East Asia Regional Verification Fee for measles and rubella, Bali, Indonesia, 21–23 June 2022. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2022. https://apps.who.int/iris/deal with/10665/360441
- World Well being Group. Measles and rubella strategic framework: 2021–2030. Geneva, Switzerland: World Well being Group; 2020. https://apps.who.int/iris/relaxation/bitstreams/1333580/retrieve
- Regional Workplace for South-East Asia. Evaluate of progress and means ahead on measles and rubella elimination actions within the WHO South-East Asia Area. New Delhi, India: World Well being Group, Regional Workplace for South-East Asia; 2022. https://apps.who.int/iris/bitstream/deal with/10665/352255/SEA-Immun-135-eng.pdf?sequence=1&isAllowed=y
Abbreviations: NA = not relevant; NC = not calculated; NR = not reported through the 12 months; P = major grade of college; RCV = rubella-containing vaccine; RCV1 = first dose of RCV; RCV2 = second dose of RCV; SEAR = South-East Asia Area; WHO = World Well being Group.
* WHO-UNICEF protection estimates, 2021 revision (as of July 2022). https://immunizationdata.who.int/
† Instances per 1 million inhabitants.
§ MMWR makes use of the U.S. Division of State’s short-form identify “Burma”; WHO makes use of “Myanmar.”
¶ Dose was not included within the vaccination schedule for that 12 months.
** Given to major grade 1 college students (aged roughly 7 years).
†† Change in rubella incidence couldn’t be calculated as a result of circumstances weren’t reported by way of WHO-UNICEF Joint Reporting Kind in 2021.
§§ RCV1 and RCV2 have been launched throughout 2016.
¶¶ The regional estimates are calculated as a part of WHO-UNICEF protection estimates, by which the denominator is the full start cohort of the area no matter the reporting standing, and the numerator is the sum of estimated vaccinated youngsters and adolescents from all reporting international locations.
FIGURE. Variety of reported rubella circumstances,* by nation,†,§ and estimated first dose rubella-containing vaccination protection¶ — World Well being Group South-East Asia Area, 2013–2021
Supply: https://immunizationdata.who.int/
Abbreviations: RCV = rubella-containing vaccine; SEAR = South-East Asia Area; WHO = World Well being Group.
* Instances of rubella reported to WHO and UNICEF by way of the Joint Reporting Kind to the WHO Regional Workplace for SEAR.
† Different international locations within the area embrace Bangladesh, Bhutan, Burma (Myanmar), Maldives, Nepal, North Korea, Sri Lanka, Thailand, and Timor-Leste.
§ MMWR makes use of the U.S. Division of State’s short-form identify “Burma”; WHO makes use of “Myanmar.”
¶ Knowledge are from WHO and UNICEF estimates of routine first RCV dose protection for SEAR.
Supply: https://www.who.int/publications/i/merchandise/SEAR-MR-Bulletin-Q3-2021
Abbreviations: CRS = congenital rubella syndrome; NA = not relevant; SEAR = South-East Asia Area; WHO = World Well being Group.
* Discarded circumstances per 100,000 inhabitants. A discarded case is outlined as a suspected case that has been investigated and decided to be neither measles nor rubella utilizing 1) laboratory testing in a proficient laboratory or 2) epidemiologic linkage to a laboratory-confirmed outbreak of one other communicable illness that’s not measles or rubella. The discarded case charge is used to measure the sensitivity of measles-rubella surveillance.
† The 12 months any type of CRS was initiated within the nation. Nations outlined a suspected measles/rubella case as “acute fever with maculopapular rash and at the least one of many following: cough, coryza, or conjunctivitis.”
§ The 12 months laboratory supported case-based surveillance with definition of a suspected measles/rubella case as “acute fever with maculopapular rash” was initiated within the nation.
¶ The 12 months any type of CRS surveillance was initiated within the nation at nationwide stage.
** MMWR makes use of the U.S. Division of State’s short-form identify “Burma”; WHO makes use of “Myanmar.”
†† CRS surveillance was initiated throughout 1973. At the moment, the identical reporting code was used for each rubella and CRS; nevertheless, throughout 2020, CRS was formally recognized with its personal reporting code separate from rubella.
Instructed quotation for this text: Khanal S, Bahl S, Sangal L, et al. Progress Towards Rubella Elimination — World Well being Group South-East Asia Area, 2013–2021. MMWR Morb Mortal Wkly Rep 2023;72:678–682. DOI: http://dx.doi.org/10.15585/mmwr.mm7225a2.
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