February 1, 2017
Dear Travel Patients,
There is currently a shortage of YELLOW FEVER vaccine, across Toronto, Canada and the world. This also occurred recently in the summer of 2016, due to production problems and outbreaks in Africa. There is a new outbreak in Brasil. At that time, WHO (World Health Organization), along with CDC (USA) and PHAC (Canada) developed the following regulations and recommendations:
- Doses of 0.1 cc, rather than the usual .5 cc, have been shown to be perfectly effective in preventing yellow fever.
- In the event of a shortage of YF vaccine, the smaller dose should be used in order to conserve supplies and to vaccinate and protect the maximum number of travellers.
- In view of a lack of longer term studies, this smaller dosage, for the time being, should be considered protective for at least 1 year, rather than the lifetime duration of the full dose of vaccine.
- Everyone receiving either dose of vaccine will receive the YELLOW CARD showing that you have been immunized.
- Because of logistical reasons, it may be necessary to “clump” people receiving the YF vaccine together.
- People who are not at risk of YF, or those with additional medical conditions or those over 60, should discuss with their provider as to whether YF vaccine is warranted.
- Recall that it is now felt (by WHO) that previous yellow fever vaccine confers lifetime immunity.
Further information regarding this issue can be found on my website/blog (www.drwisetravel.com – May 2016), at CDC, WHO and PHAC.
Mark Wise MD DTM&H (London)