Sir Liam said the H1N1 vaccines are expected to be licensed soon by the European regulators and that he would have 'preferred more breathing space' before cases started to rise this Autumn in order to get the immunisation programme in place.
Pregnant women, health and social care workers, people aged between six months and 65 years who have underlying health conditions and people living with patients who have compromised immune system will be vaccinated this year.
Early trials show that one dose may be effective but early data from tests in children suggest they may still require two doses for a full immune response, Dr David Salisbury, head of the Immunisation at the Department of Health said.
The World Health Organisation announced that several countries including Australia, China, Hungary and the US have already licensed vaccines for the pandemic strain of H1N1.
Japan and several countries in Europe will shortly follow, according to the WHO.
Dr Salisbury said other countries have different licensing procedures and other vaccines which has meant they have been approved earlier.
Sir Liam added that in some areas swine flu cases have risen at a slower rate than during the first wave in July and some test results suggest that a larger number of children may have been infected earlier this year but not shown symptoms.
This has given them some protection and they are not falling ill now.
The largest number of school outbreaks has been in Yorkshire and Humber, with 27 outbreaks, but Sir Liam said this is probably because the data collection there has been more stringent.
He added that were 'probably more (outbreaks) than that , that we have not heard about'.
The number of pupils infected in an outbreak will vary and it is not known how many children in total are involved in those outbreaks. Schools are not being closed any more when an outbreak occurs as officials say this causes disruption and does little to slow the spread.
We have stocked Tamiflu antiviral at home. Ideally within 6 hours and at the very latest within 48 hours of flu symptoms we will commence Tamiflu treatment. I bought Tamiflu online (£50 per dose) from pimsreg.com registered with the Royal Pharmaceutical Society of Great Britain (RPSGB) and listed in "websites displaying the internet pharmacy logo".
Update 26 July 2009: Tamiflu - currently one dose is free to people exhibiting swine flu symptons - get Tamiflu from the UK Government Pandemic Flu site.
On 1 September my son went down with, what our doctor said 'ticked all the boxes' as swine flu. After 102F, vomiting, diarohea, headaches ... and taking tamiflu (our emergency stock) and on Thursday Relenza, he seems on the mend (4 September 8pm).
Diagram of influenza virus nomenclature (for a Fujian flu virus)
Structure of the influenza virion. The hemagglutinin (HA) and neuraminidase (NA) proteins are shown on the surface of the particle. The viral RNAs that make up the genome are shown as red coils inside the particle and bound to Ribonuclear Proteins (RNPs).