Vaccine Production Via Mammalian Cell Culture Systems
Pharma Bio World|February 2019

Mammalian cell culture systems are starting to dominate the production of vaccines for viral diseases such as rabies. Making use of existing biopharma infrastructure, these advances might even spell the end for the use of hens’ eggs in future vaccine development.

Vaccine Production Via Mammalian Cell Culture Systems

Today, the rapidly expanding demand for vaccine products for viral diseases such as rabies has necessitated the development of more sophisticated production techniques based around cell culture systems. This article reviews vaccine production strategies, with a focus on rabies, looking specifically at the use of the Vero cell line – used worldwide and approved by the US Food and Drug Administration – as well as media technology and the bioreactor options available.

Growing Demand

Viral diseases, including rabies, are worldwide challenges for the international biomedical community. The World Health Organization (WHO) notes that over 32,000 rabies-related deaths were reported in 1998, while annual deaths worldwide from the virus grew to 55,000 by 2006 1,2 .

Rabies is often transmitted to humans from infected domestic animals. Dogs infected with rabies can become extremely aggressive and attacks on humans are widespread, especially in certain Asian countries where using unleashed dogs for home security is common. It is spread through the saliva of infected animals and bites can be fatal.

Since the 18th century, vaccination has proven to be the most successful – and perhaps the only – route to the total elimination of viral diseases such as rabies. From the early work of pioneers such as Jenner and Pasteur, vaccination was put on a sound scientific footing. Demand for vaccine products has continued to increase ever since, prompting the advances in production technology that we see today.

Viral Cultivation

The expanding vaccine requirements have led to techniques for growing large quantities of antigenic proteins. Traditionally, viruses have been grown in embryonated hens’ eggs, but numerous shortcomings compromise their utility. These include a bottleneck in the availability of high-quality, pathogen-free eggs, as well as low titers of emerging viruses 3) .

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