County Immunizations and Exemption Rates by School Year, Grade, Vaccine, and School Type

The annual pre-kindergarten (pre-K) through 12th grade school immunization survey collects school-level, grade-specific data on vaccine coverage and exemptions. The survey collects vaccination and exemption status data on children who entered the school system on or before a specified date during the fall semester. Individual vaccine information on each student is not collected.

This table shows the vaccination exemptions (medical and religious) and percentage vaccinated and compliant for each school-entry mandated vaccine series reported by school year, county, and grade. Percentage of students vaccinated is the number of students with the required number of doses of a given vaccine divided by the total number of students. Data for each grade includes all schools who reported with that given grade level.

School-mandated vaccine series for students enrolled in kindergarten are inactivated polio, DTaP (diphtheria, tetanus, and acellular pertussis), MMR (measles, mumps, and rubella), hepatitis B, varicella and hepatitis A. Additional mandated vaccines for students enrolled in 7th grade include meningococcal conjugate vaccine (MCV) and Tdap (tetanus, diphtheria, and acellular pertussis). Influenza vaccine is a requirement for pre-K students only, who are 24 through 59 months of age.

Each child has 1 of 4 possible vaccination statutes: Vaccinated, Exempt (Religious), Exempt (Medical) or Non-compliant. The criteria shown below are used to assess whether a child is considered vaccinated.

• Flu = at least 1 dose of annual influenza vaccine (pre-K only). This is a school entry requirement only for pre-K students 24 through 59 months of age.
• Polio = at least 3 doses of inactivated polio vaccine, with the last dose on or after their 4th birthday. This is a school entry requirement starting in kindergarten.
• DTaP = at least 4 doses of DTaP vaccine, with the last dose on or after their 4th birthday. This is a school entry requirement starting in kindergarten.
• MMR = at least 2 doses of MMR vaccine separated by at least 28 days, with the 1st dose on or after their 1st birthday. This is a school entry requirement starting in kindergarten.
• HepB = at least 3 doses of hepatitis B vaccine, with the last dose on or after 24 weeks of age. This is a school entry requirement starting in kindergarten.
• Varicella = at least 2 doses of varicella vaccine separated by at least 28 days, with the 1st dose on or after their 1st birthday, or a reliable history of chickenpox disease. This is a school entry requirement starting in kindergarten.
• HepA = at least 2 doses of hepatitis A vaccine, given a minimum of six calendar months apart, with the 1st dose on or after their 1st birthday. This is a school entry requirement starting in kindergarten. Starting with the 2019-2020 school year the annual survey included data collection on hepatitis A vaccine for 7th grade students.
• MCV = at least 1 dose of meningococcal conjugate vaccine. This is a school entry requirement starting in 7th grade.
• Tdap = at least 1 dose of Tdap vaccine. This is a school entry requirement starting in 7th grade.
• All = Percentage of students with all above vaccine series required for that grade level.

Children without a record of vaccination, but with serologic proof of immunity to certain diseases (measles, mumps, rubella, hepatitis B, hepatitis A, and varicella), meet school entry requirements and may be counted as vaccinated.

Data Limitations and Considerations:
• The school level data shown here are as tabulated and reported by schools and discrepancies may exist.
• The Immunization Program identifies outliers and internally inconsistent data points and works with schools to resolve any data quality issues, when possible.
• CT DPH cannot verify the accuracy of vaccine data for individual children or whether the documentation necessary to claim an exemption has been submitted.
• Data are collected at the beginning of the school year, by which time vaccines are due. As the year progresses, immunization rates may increase as additional children receive required immunizations. Additionally, the student body is dynamic and as students arrive and leave school, the immunization rates are impacted.
• Vaccine status is assessed on the level of the child and not on each vaccine. Once a child is listed as exempt, vaccination data is no longer collected in the survey for that child. Therefore, children with exemptions are not counted as vaccinated in the vaccine level assessments although they may have received some vaccines.
• Pre-K influenza data for the 2019-2020, 2020-2021, 2021-2022, 2022-2023 school years may be incomplete because follow up of non-responsive schools was not conducted due to lack of staffing.

年度学前教育（学前班）至12年级学校免疫接种调查收集了学校层面的、按年级划分的疫苗覆盖率和豁免数据。调查收集了在秋季学期前或在此期间进入学校系统的儿童的疫苗接种和豁免状态数据。不收集每个学生的个别疫苗信息。

此表显示了按学年、县和年级报告的学校入学强制疫苗系列的疫苗接种豁免（医疗和宗教）以及疫苗接种率和合规率。疫苗接种率是指接种了规定剂量疫苗的学生人数除以学生总数。每个年级的数据包括报告了该年级水平所有学校的资料。

学前班学生必须接种的疫苗系列包括：灭活脊髓灰质炎疫苗、DTaP（白喉、破伤风和无细胞百日咳）、MMR（麻疹、风疹和德国麻疹）、乙型肝炎、水痘和甲型肝炎。7年级学生必须接种的额外疫苗包括脑膜炎球菌结合疫苗（MCV）和Tdap（破伤风、白喉和无细胞百日咳）。流感疫苗仅对学前班学生为必接种项，年龄在24至59个月之间。

每个儿童都有四种可能的疫苗接种状态之一：已接种疫苗、豁免（宗教）、豁免（医疗）或不符合。以下标准用于评估儿童是否被视为已接种疫苗。

• 流感疫苗：至少接种过一次年度流感疫苗（仅限学前班）。这是学前班24至59个月龄学生的入学要求。
• 脊髓灰质炎疫苗：至少接种过三次灭活脊髓灰质炎疫苗，最后一次接种日期在儿童4岁或之后。这是从学前班开始实施的入学要求。
• DTaP疫苗：至少接种过四次DTaP疫苗，最后一次接种日期在儿童4岁或之后。这是从学前班开始实施的入学要求。
• MMR疫苗：至少接种过两次MMR疫苗，两次接种间隔至少28天，第一次接种日期在儿童1岁或之后。这是从学前班开始实施的入学要求。
• 乙型肝炎疫苗：至少接种过三次乙型肝炎疫苗，最后一次接种日期在儿童24周龄或之后。这是从学前班开始实施的入学要求。
• 水痘疫苗：至少接种过两次水痘疫苗，两次接种间隔至少28天，第一次接种日期在儿童1岁或之后，或具有可靠的鸡痘病史。这是从学前班开始实施的入学要求。
• 甲型肝炎疫苗：至少接种过两次甲型肝炎疫苗，两次接种间隔至少六个月，第一次接种日期在儿童1岁或之后。这是从学前班开始实施的入学要求。从2019-2020学年开始，年度调查包括对7年级学生甲型肝炎疫苗的数据收集。
• 脑膜炎球菌结合疫苗：至少接种过一次脑膜炎球菌结合疫苗。这是从7年级开始实施的入学要求。
• Tdap疫苗：至少接种过一次Tdap疫苗。这是从7年级开始实施的入学要求。
• 所有疫苗系列：该年级水平所需所有疫苗系列的疫苗接种学生百分比。

未接种疫苗记录但具有某些疾病（麻疹、风疹、德国麻疹、乙型肝炎、甲型肝炎和水痘）免疫血清学证据的儿童，符合入学要求，并可计为已接种疫苗。

数据限制和注意事项：
• 此处显示的学校层面数据是学校报告和汇总的，可能存在差异。
• 免疫接种计划识别异常值和内部不一致的数据点，并在可能的情况下与学校合作解决任何数据质量问题。
• 康涅狄格州DPH无法验证个别儿童的疫苗接种数据的准确性或是否提交了必要的文件以主张豁免。
• 数据在学年伊始收集，此时疫苗应在规定时间内接种。随着时间的推移，由于更多儿童接种了所需的疫苗，免疫接种率可能会上升。此外，学生群体是动态的，随着学生的到来和离开，免疫接种率也会受到影响。
• 疫苗接种状态是在儿童层面评估的，而不是在每项疫苗层面。一旦儿童被列为豁免，调查中就不再收集该儿童的疫苗接种数据。因此，具有豁免权的儿童在疫苗水平评估中不计为已接种疫苗，尽管他们可能接种了一些疫苗。
• 2019-2020、2020-2021、2021-2022、2022-2023学年的学前班流感数据可能不完整，因为由于缺乏人员而未对非响应学校进行跟进。