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H-IVIG Treatment for Severe H1N1 2009

Information source: The University of Hong Kong
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Novel 2009 Influenza A (H1N1) Infection

Intervention: Hyperimmune intravenous immunoglobulin (Drug); Intravenous immunoglobulin (Drug)

Phase: N/A

Status: Completed

Sponsored by: The University of Hong Kong

Official(s) and/or principal investigator(s):
Ivan FN Hung, MD FRCP, Principal Investigator, Affiliation: The University of Hong Kong


Treatment with hyperimmune intravenous immunoglobulin (H-IVIG), derived from convalescent plasma from patients recovered from H1N1 2009 influenza A infection, for patients with severe H1N1 2009 infection will decrease mortality, reduce viral load, and shorten the length of stay in ICU and hospital.

Clinical Details

Official title: Hyperimmune Intravenous Immunoglobulin Treatment for Severe H1N1 2009 Infection

Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment

Primary outcome: Mortality

Secondary outcome:

Adverse events

ICU length of stay

Hospital length of stay

Nasopharyngeal viral load

Cytokine/ chemokine

Detailed description: Since the emergence of the novel swine origin influenza A virus (H1N1 2009) in Mexico in March 2009, the virus has led to a pandemic in over 170 countries, resulting in over 180 thousands microbiologically confirmed cases and over 18000 mortality. This strain represents a quadruple re-assortment of two swine strains, one human strain, and one avian strain of influenza. Although the H1N1 2009 is causing a mild disease and has a relatively low mortality rate currently in Hong Kong, severe cases have been reported. Patients infected with severe H1N1 2009 have overwhelmed the intensive care services in these countries and the mortality has rose up to 6% in Argentina and Brazil, and 0. 4% in Australia. This is very much higher than the 0. 06% mortality rate of the seasonal flu. Furthermore, there were reports of H1N1 2009 oseltamivir resistance and zanamivir is difficult to be delivered to the consolidated lungs in the severe cases when such drug is most needed. In Hong Kong, vaccination for the H1N1 2009 was prioritised to the older people aged 65 or above with chronic illness, younger people with chronic illness and health care workers. The healthy adults aged 18 to 65, who are most at risk of developing severe H1N1 2009 was not covered by the vaccination program. Experience from 1918 H1N1 pandemic and single case report on the treatment for severe H5N1 infection (Zhou et al. 2007) showed that hyperimmune convalescent plasma is useful (Luke et al. 2006). Mice experiments also showed that antibody therapy is highly effective in the case of H5N1 infection (Heltzer ML et al. 2009, Writing Committee of the Second World Heath Organization, 2008). Therefore, convalescent plasma from patients recovered from H1N1 2009 infection can be harvested to prepare for hyperimmune intravenous immunoglobulin (H-IVIG) and the prepared H-IVIG can be assessed in a randomised controlled trial for treatment of patients with severe H1N1 2009 infection.


Minimum age: 18 Years. Maximum age: N/A. Gender(s): Both.


Inclusion Criteria:

- (fulfill all criteria): male or female patients 18 years or older

- written informed consent by patient or next of kin (if patients too ill)

- diagnosis of H1N1 2009 infection satisfying both clinical and laboratory criteria:

1. Laboratory criteria: at least one RT-PCR positive for H1N1 2009 from one of the clinical specimens (NPA, ETA, blood, urine or stool). 2. Clinical criteria: patients admitted to ICU with severe community acquired pneumonia as defined by a CURB-65 score of 3 or more

- deterioration during treatment with optimal antiviral (oral or inhaler agents only)

and typical and atypical antimicrobial coverage

- required ICU and ventilatory support and within 7 days onset of symptoms.

Exclusion Criteria:

- age below 18 years

- known hypersensitivity to immune globulin or any components of the formulation

- known IgA deficiency

- acquire the H1N1 2009 infection from health care facility

- moribund patients or refusal of informed consent.

Locations and Contacts

The University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong
Additional Information

Related publications:

Hung IF, To KK, Lee CK, Lee KL, Chan K, Yan WW, Liu R, Watt CL, Chan WM, Lai KY, Koo CK, Buckley T, Chow FL, Wong KK, Chan HS, Ching CK, Tang BS, Lau CC, Li IW, Liu SH, Chan KH, Lin CK, Yuen KY. Convalescent plasma treatment reduced mortality in patients with severe pandemic influenza A (H1N1) 2009 virus infection. Clin Infect Dis. 2011 Feb 15;52(4):447-56. doi: 10.1093/cid/ciq106. Epub 2011 Jan 19.

Hung IF, To KK, Lee CK, Lin CK, Chan JF, Tse H, Cheng VC, Chen H, Ho PL, Tse CW, Ng TK, Que TL, Chan KH, Yuen KY. Effect of clinical and virological parameters on the level of neutralizing antibody against pandemic influenza A virus H1N1 2009. Clin Infect Dis. 2010 Aug 1;51(3):274-9. doi: 10.1086/653940.

To KK, Hung IF, Li IW, Lee KL, Koo CK, Yan WW, Liu R, Ho KY, Chu KH, Watt CL, Luk WK, Lai KY, Chow FL, Mok T, Buckley T, Chan JF, Wong SS, Zheng B, Chen H, Lau CC, Tse H, Cheng VC, Chan KH, Yuen KY. Delayed clearance of viral load and marked cytokine activation in severe cases of pandemic H1N1 2009 influenza virus infection. Clin Infect Dis. 2010 Mar 15;50(6):850-9. doi: 10.1086/650581.

Wu JT, Lee CK, Cowling BJ, Yuen KY. Logistical feasibility and potential benefits of a population-wide passive-immunotherapy program during an influenza pandemic. Proc Natl Acad Sci U S A. 2010 Feb 16;107(7):3269-74. doi: 10.1073/pnas.0911596107. Epub 2010 Feb 1.

Wong HK, Lee CK, Hung IF, Leung JN, Hong J, Yuen KY, Lin CK. Practical limitations of convalescent plasma collection: a case scenario in pandemic preparation for influenza A (H1N1) infection. Transfusion. 2010 Sep;50(9):1967-71. doi: 10.1111/j.1537-2995.2010.02651.x.

Zhou B, Zhong N, Guan Y. Treatment with convalescent plasma for influenza A (H5N1) infection. N Engl J Med. 2007 Oct 4;357(14):1450-1.

Luke TC, Kilbane EM, Jackson JL, Hoffman SL. Meta-analysis: convalescent blood products for Spanish influenza pneumonia: a future H5N1 treatment? Ann Intern Med. 2006 Oct 17;145(8):599-609. Epub 2006 Aug 29.

Starting date: January 2010
Last updated: June 7, 2012

Page last updated: August 23, 2015

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