influenza remains a serious disease and a leading cause ofmortality in all regions of the world [1,2]. Influenza viruses arecharacterized by their segmented single-stranded ribonucleic acid(RNA) genome. The virus is surrounded by a lipid containing enve-lope containing two major glycoproteins: HA and neuraminidase(NA). The HA glycoprotein is widely accepted as the critical antigenfor vaccine protection as antibodies against HA exhibit neutralizingactivity [3]. The HA glycoproteins continue to evolve, and there-fore the influenza virus presents a unique challenge to vaccine companies as the vaccine composition changes frequently, mostoften on an annual basis. This is in contrast to vaccines for otherviral infectious diseases such as Hepatitis A, Hepatitis B, or Measlesfor which the composition of vaccines stays the same from year toyear and in these examples the biggest challenge for the manufac-turer is to keep making exactly the same product for decades [4].The World Health Organization (WHO) invites influenza expertstwice per year to make recommendation for the vaccine composi-tion based on complex influenza surveillance data. For the NorthernHemisphere the influenza vaccine composition is recommendedby WHO in February and generally this recommendation is beingconfirmed by the Vaccine and Related Biological Products AdvisoryCommittee (VRBPAC) one week later for the influenza vaccine tobe distributed later in the same year.Egg based manufacturing for influenza has been in place sincethe 1940s and while playing a central role until now for vac-cine supply the technology has many deficiencies. Mutations that are made in the egg-adapted influenza strain in order to improvevirus productivity have been correlated with poor vaccine effi-cacy in 2012–2013 [5,6]. Purification of the relevant antigen HAfrom the mixture of virus, chicken embryo and egg componentsis a challenge not to mention the necessity of maintaining asepticprocessing conditions, requiring the use of antibiotics throughoutthe manufacturing process. The production throughput can onlybe increased by multiplication of the number of eggs. Finally, thechicken embryo supply is highly vulnerable in the case of an avianbased influenza virus. As an example, it has been reported that theavian H7N9 influenza virus has been detected in chickens in manyparts of China [7]. Given the importance of protecting the publicagainst virulent new forms of influenza and recognizing that thecurrent main method of making influenza vaccine based on usingeggs is highly vulnerable to avian flu strains such as H7N9 it hasbeen visionary of various government agencies including NIH andBARDA to give strong support to the development of alternativemethods of making influenza vaccine.In this example, insect cells are grown to modest cell densitiesusing suspension culture in animal protein free media and infectedwith recombinant baculovirus containing the HA gene. A Univer-sal Process for cell culture and purification has been developed sothat a change can be rapidly made from one HA to another. Basi-cally, all that is required is the DNA sequence for the type HA. Thisprocess uses the same SF+ derived cell bank adapted for growth insuspension culture and to serum free media regardless of HA type.On January 16, 2013 the Protein Sciences HA antigen Flublok®vaccine was approved by the FDA. As described in this paper, theUniversal ‘flu process is scaleable in a simple stirred tank Bioreactorand has been successfully demonstrated up to the 2500 L scale. Thisprocess can either be used for seasonal ‘flu vaccine production orfor pandemic ‘flu vaccine and strain changes are rapidly made.