Whooping cough returned to its normal level in 2017

Whooping cough still occurs, particularly among small children, unvaccinated infants and older school children. Furthermore, there is a peak among adults aged 35-50 years of age.

After the latest whooping cough ended in the beginning of 2017, the number of cases seen in the rest of the year dropped to the normal level.

A total of 1,068 whooping cough cases were detected in 2017. The highest number of cases was seen in Copenhagen, North Zealand and Funen, and the lowest on Bornholm and in North Jutland.

In 2016, Denmark witnessed a whooping cough epidemic counting a total of 2,086 cases. That is twice as many as the normal level, which is 500-1,000 annual cases. The epidemic ran from May 2016 until and including February 2017, see Figure.

Laboratory-confirmed whooping cough cases per month from 2007 to 2017

If a child below 2 years of age gets whooping cough, and this is confirmed by a laboratory, the doctor has an obligation to notify the case. Thus, a total of 107 children under the age of 2 years were notified with whooping cough.

Among these children, 57 had not received vaccination, whereas 16 had received all of the three initial whooping cough vaccinations offered to infants. Young unvaccinated or partly vaccinated children are more affected by the condition than others and they are more often admitted to hospital. No deaths due to whooping cough were recorded in this age group in 2017.

Whooping cough is a highly infectious bacterial infection that causes very heavy coughing spells. Among small children, the spells are characterised by a whooping sound that occurs then the child inhales following the spell. Whooping cough vaccination forms part of the vaccination programme at 3, 5 and 12 months of age and at 5 years of age. The main aim of the vaccinations is to protect infants against the infection that may run a serious course and which is occasionally life-threatening in this age group.

The Danish Health Authority is currently assessing if the prevention of whooping cough among infants may be improved. This is done via a working group under the Committee of Vaccination. 

Read more in EPI-NEWS 16/18 and on the SSIs website

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