Running an effective mass immunisation campaign, vaccinating children in Nigeria against measles is a logistical nightmare.
Our immune system protects us but when it comes to some mosquito-borne disease, it can work against us. What are the implications for the development of a Zika virus vaccine?
From November 1, the shingles (herpes zoster) vaccine will be available for free to people aged 70 to 79 years. So how and why do you get shingles, and who should be vaccinated?
The Commonwealth government's "no jab, no pay" legislation is disadvantaging migrant children. Many families are having essential payments withheld despite their children being vaccinated.
Every year hundreds of thousands of children die from vaccine-preventable diseases. Africa leaders could change this if they improved vaccination efforts.
Overall rates of vaccine objection have remained largely unchanged since 2001.
Bats can carry some of the deadliest diseases known to affect humans and yet they don't seem to get sick. So what can we learn from a bat's immune system?
Despite Nigeria's success in eradicating polio, it is struggling to get a grip on mother and child vaccinations.
As more vaccines have been developed, the challenge of delivering them with minimal pain and number of visits to the doctor has increased. Needle-free vaccinations might help.
Despite the success of mass immunisation campaigns in Africa, the continent still lags behind in meeting global vaccination targets.
The immune system does such a good job most of the time that we only really think about it when things go wrong. But to provide such excellent protection, it must constantly learn.
Recent polio outbreaks in Ukraine and Mali, caused by a vaccine-derived form of poliovirus, don't mean the vaccine isn't working. On the contrary, they are a reminder to keep up vaccination rates.
Eradicating the last 1% of polio cases in the world requires an endgame plan centred on immunisation and surveillance.
The positive impact of the polio eradication initiatives on the continent can be felt across the health sector in other health programmes.
Nigeria's strategy to eliminate polio was so effective that it was duplicated to deal with ebola. So why did the country take so long to get off the list of polio-endemic countries?
It's been one year since the last polio case was reported in Africa. If the continent keeps this up, it could be declared polio free by 2018.
When the measles vaccine was introduced, it was associated with reductions in more childhood disease deaths than were actually caused by the measles. How does that work?
Tucked away in the budget papers is an intitiative worthy of applause – the establishment of an adult immunisation register and the expansion of the childhood register to include adolescents.
Australia is unique in using parental financial incentives for immunisation.
The plan to withhold payments of child-care and family tax benefits for unvaccinated children could cost non-compliant parents up to A$15,000 a year. But is it ethical to punish parents?