133 Molesworth Street
PO Box 5013
Wellington 6140
New Zealand
T+64 4 496 2000
22 August 2022
A Smith
By email: [FYI request #20020 email]
Ref: H2022008567
Tēnā koe A Smith,
Response to your request for official information
Thank you for your request under the Official Information Act 1982 (the Act) to Manatū
Hauora (Ministry of Health) on 26 July 2022. You requested:
“...the number of people by month who caught Covid 19 within 14 days of a
Vaccination. How were these cases reported in regards to vaccination status?”
Please refer to the below tables that show the number of people who caught COVID-19
within 14 days of vaccination and the vaccination status of those people.
Table 1: Cases by month of people who caught COVID-19 within 14 days of a
vaccination (data as of 16 August 2022)
Date
Total
March 2021
.s
July 2021
.s
August 2021
60
September 2021
66
October 2021
288
November 2021
597
December 2021
207
January 2022
75
February 2022
11,100
March 2022
28,575
April 2022
3,522
May 2022
1,143
June 2022
390
July 2022
483
August 2022
120
Grand Total
46,630
Table 2: Vaccination status of people who caught Covid-19 within 14 days of a
vaccination (data as of 16 August 2022)
Infection within 14 days from COVID-19
Total
Vaccination
Infection after first dose
4647
Infection after second dose
7263
Infection after third dose
34722
Grand Total
46630
Manatū Hauora utilises confidential y methods as recommended by Stats NZ. The below
information explains the methods used and why we use these methods.
Confidentiality methods
To avoid revealing sensitive information about potentially identifiable individuals in our data,
we apply two data confidentiality methods, perturbation, and suppression, to any data that is
not already released as exact counts on the Ministry’s website.
Perturbation is the adding of random noise to data and suppression is not providing data, for
example, rounding up or rounding down, and suppression is not providing data, where doing
so could compromise confidentiality.
For data that is not already provided exactly on the website:
•
All values between 1 and 5 are suppressed
•
Zero values are provided exactly, except for in sensitive categories where a zero
value may be suppressed to protect other low values
•
Values of 6 and above are perturbed using fixed random rounding to base 3
(FRR3). This entails rounding values to neighbouring multiples of 3. For example, 11
may be rounded to 12 or 9.
FRR3 is a best-practice confidentiality method recommended by Stats NZ. For more
information please visit:
www.data.govt.nz/toolkit/privacy-and-security/understanding-data-
confidentiality/data-confidentiality-principles-and-methods-report/ Examples of confidentially methods are demonstrated in the below table:
True value Displayed value 4
.s (suppressed)
11
9 or 12
15
15
16
15 or 18
301
300 or 303
I trust this information fulfils your request. Under section 28(3) of the Act, you have the right
to ask the Ombudsman to review any decisions made under this request. The Ombudsman
may be contacted by email at:
[email address] or by calling 0800 802 602.
Page 2 of 3
Please note that this response, with your personal details removed, may be published on the
Manatū Hauora website at:
www.health.govt.nz/about-ministry/information-
releases/responses-official-information-act-requests. Nāku noa, nā
Gill Hall
Group Leader, Intelligence, Surveillance and Knowledge Public Health Agency, Ministry of Health
Page 3 of 3
