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Public health advisory


January 8, 2014
First Influenza-Related Deaths Reported in Marin County

Marin County Public Health has been notified of the first influenza-associated deaths
of the 2013-2014 influenza season. The first occurred on December 27, in a 63 year
old man with significant chronic medical conditions. On January 6, 2014, a 48 year
old previously healthy woman died of influenza-related Acute Respiratory Distress
Syndrome (ARDS). Both patients were Marin residents and were hospitalized in
intensive care. Neither had received the influenza vaccine.
In addition, we have received reports of several other influenza patients hospitalized
in Marin; most of these patients have been young or middle-aged adults. The
predominant influenza virus nationally and in Marin County this season to date is
influenza A H1N1. This is the same virus that caused the 2009 H1N1 pandemic.
Other counties are reporting cases of non-elderly adults with critical illness due to
influenza A (H1N1) virus, similar to the epidemiology observed during the 2009
It is still early in the influenza season and influenza activity is expected to increase in
the coming weeks to months. Therefore, primary prevention with influenza
vaccination is strongly recommended: All persons aged 6 months and older,
including healthcare personnel, should receive influenza vaccination now.
The information in this email is primarily intended for clinicians caring for
influenza patients
, particularly severely ill patients. While this information is
consistent with CDC recommendations and was provided by CDPH, it is not meant
to represent official recommendations from Marin HHS, CDPH or CDC. Feel free to
share this information with colleagues who are involved in clinical management of
influenza patients. For updated information on influenza activity, visit
. For other recommendations, clinicians can view the CDC
influenza we .
High-risk persons and influenza complications
1) Persons at high-risk for influenza complications include infants and young children
aged <2 years, pregnant women, elderly persons, persons of any age with certain
chronic co-morbidities (cardiac: coronary artery disease, CHF [but not HTN alone];
pulmonary; COPD, asthma; renal disease; hematologic disorders; metabolic
disorders; neurologic and neuromuscular disorders;
immunocompromised/immunosuppression; morbid obesity; nursing home residents;
American Indian/Alaska Native). However, otherwise healthy non high-risk persons
can also experience severe and fatal complications associated with influenza, especially with influenza A(H1N1)pdm09 virus infection. 2) Clinical complications associated with influenza include exacerbation of underlying
chronic disease, viral pneumonitis/pneumonia/respiratory failure/ARDS and
croup/bronchiolitis in infants, bronchospasm, secondary bacterial pneumonia,
encephalopathy/encephalitis; myocarditis/pericarditis; myositis/rhabdomyolysis; etc.
Influenza Treatment
1) Empiric antiviral treatment with oral/enteric oseltamivir should be started ASAP on
any hospitalized patient with suspected influenza. There is no need to wait for
influenza testing results – the greatest clinical benefit is when antiviral treatment is
started as soon as possible, ideally closest to illness onset. However, observational
studies indicate the clinical benefit of reducing complications and increasing survival
even when antiviral treatment is started late. For high-risk outpatients and persons
with progressive disease who are not being admitted, antiviral treatment is also
recommended as soon as possible.
2) Oral/enteric oseltamivir treatment duration is five days; consider longer duration for critically ill patients. a) Critically ill patients with influenza may be treated with higher doses of oseltamivir (e.g., 150 mg orally every 12 hours for 10 days in patients with normal renal function). Limited data indicate that administering oseltamivir via a gastric tube can provide systemic absorption in some critically ill patients. b) Gastric stasis or bleeding can make the gastric tube administration route problematic because of the potential for reduced absorption of medication. For these patients, parenteral medications might be preferable, but no clinical trials have demonstrated increased benefit, and none are FDA-approved, although an intravenous formulation of zanamivir is available under an emergency investigational new drug (EIND) protocol (see below). 3) If patients continue to do poorly on oral oseltamivir or have gastric stasis or bleeding, use of intravenous zanamivir may be considered. IV zanamivir is an investigational drug that is chemically similar to oseltamivir and is available for compassionate use through the manufacturer GSK, and by urgent EIND approval by the Food and Drug Administration. a) To make an EIND request for IV zanamivir, contact: 301-796-1500 (8:00AM - 4:30PM EST). After business hours (4:30 pm – 8:00 am EST): call the FDA Emergency Coordinator at 866-300-4374 or 301-796-8240 or call the CDER Emergency Coordinator at 301-796-9900. b) Dosage adjustment for IV zanamivir may be indicated for patients requiring renal replacement therapy or who are on ECMO. c) GSK is conducting an IV zanamivir clinical trial at two sites in California: Chula Vista and La Mesa. For Chula Vista call 619-955-5246 and for La Mesa call 619-567-1550. For more information see: d) Patients with respiratory failure can have prolonged influenza viral replication in the lower respiratory tract (weeks), and immuncompromised patients can shed influenza viruses for weeks to months. Therefore, there is a risk for emergence of oseltamivir resistance. IV zanamivir can treat oseltamivir-resistant influenza A(H1N1)pdm09 virus infection. 4) Do not expect rapid clinical improvement once antiviral treatment is started. The main pathogenesis is cytokine dysregulation, but reducing influenza viral load in the respiratory tract may be helpful. Other complications associated with influenza in a patient with respiratory failure include vasopressor-dependent shock and renal failure. 5) Avoid high-dose systemic corticosteroids for treatment of influenza except for patients on chronic treatment when treating the underlying chronic disease exacerbation (e.g., COPD, asthma exacerbation) because high-dose corticosteroids may prolong influenza viral shedding and increase the risk for VAP and death. However, low-dose hydrocortisone is okay in influenza patients with suspected/documented adrenal insufficiency or refractory septic shock. 6) CDPH has recently received requests for the unapproved antiviral drug peramivir IV to treat hospitalized patients with influenza. During H1N1, peramivir was potentially available under an FDA issued Emergency Use Authorization (EUA) on a case by case basis when requested by a treating physician for a particular hospitalized patient. The EUA for distribution and use of peramivir expired on June 23, 2010. According to CDC guidance, any leftover or unused peramivir is to be destroyed and not kept for future use. Peramivir is currently not available from either the CDC or from the manufacturer. 5) For patients who are intubated, use of the zanamivir disc inhaler is not possible.
Suboptimal delivery to sites of infection in patients with pneumonic or
extrapulmonary disease is of concern for patients with severe respiratory illness. Use
of the nebulized preparation of the licensed powder formulation contained in the disc
inhaler is not recommended because it has been demonstrated to clog ventilator
1) Collect both upper and lower respiratory tract specimens for influenza testing in
hospitalized patients with suspected influenza - if ventilated, endotracheal aspirate
specimens should be sent unless a BAL is done for other diagnostic reasons (lower
respiratory tract specimens can yield the diagnosis when influenza viral shedding is
no longer detectable in the upper respiratory tract, therefore negative influenza
testing results on an upper respiratory tract specimen in a critically ill patient with
lower respiratory tract disease does not exclude influenza).
2) For influenza testing, RT-PCR is recommended. There are approved molecular
assays and also testing can be done at public health laboratories and academic
medical centers; antigen detection tests such as rapid influenza diagnostic tests and
immunofluorescence assays (DFA) lack sensitivity and false negative results are
common so a negative result does not rule out influenza virus infection; repeat by
RT-PCR assay if influenza is still suspected.
3) Patients receiving antiviral medications who do not respond to treatment might have an infection with an antiviral-resistant influenza virus. Oseltamivir resistance, sometimes within 1 week of treatment initiation, has been reported particularly among immunocompromised patients with 2009 H1N1 virus infection who were receiving treatment with oseltamivir. Oseltamivir resistance should be suspected in patients who are persistently positive with repeated PCR testing, particularly if they are immunocompromised. Specimens from these patients can be sent to the CDPH VRDL and CDC for testing for antiviral resistance. 4) All specimens collected on critically ill or fatal cases with suspected or laboratory-
confirmed influenza should be referred to a public health laboratory for further PCR
confirmation and subtyping. The CDPH Viral and Rickettsial Disease Laboratory is
also available for surge capacity testing as needed.
5 )Specimens may be dropped off the Marin County Wellness Center at 3260 Kerner
Boulevard, San Rafael, CA 94904, or call the Regional Public Health Laboratory at
(707) 784-4410 for specimen transport. Clinical laboratories may send influenza
specimens to the Regional Public Health Laboratory for confirmation and strain
Infection Control
Infection prevention and control for influenza is an essential part of clinical
management for influenza patients, including prevention of healthcare-associated
influenza. Cases of critically ill patients with healthcare-associated influenza have
already been reported in the U.S. this season.
• All healthcare personnel should receive influenza vaccination this season.
• Standard and droplet precautions should be implemented for influenza patients.
• Influenza patients should be isolated in a single room or cohorted with other
influenza patients if a single room is not available.
• For aerosol-generating procedures, healthcare personnel should use an N95
respirator or higher level of respiratory protection.
• Influenza prevention should be strengthened throughout the hospital, including the
ER, wards, and ICU, with active daily surveillance for healthcare-associated
influenza (new fevers and new respiratory symptoms in hospitalized patients).
• Ill healthcare personnel should be excluded from work.
• Visitors should be screened for illness. Visitors to patients in isolation for influenza
should be limited to persons who are necessary for the patient’s emotional well-being
and care. Visitors who have been in contact with the patient before and during
hospitalization are a possible source of influenza for other patients, visitors, and staff.
Some hospitals do not permit young children to visit during influenza/RSV season.
• Take steps to ensure all persons with symptoms of a respiratory infection adhere to
respiratory hygiene, cough etiquette, hand hygiene, and triage procedures
throughout the duration of their visit, including providing facemasks to such persons.
• For more information on influenza infection con

• Hospitals: Laboratory-confirmed fatal influenza cases <65 years of age are
reportable in California and laboratory-confirmed influenza cases requiring intensive
care are reportable.
Report cases of confirmed and suspect severe influenza (within 1 hour) to Marin CDPC (415) 473-7805 or (415) 473-4163. After 5:00 p.m., weekends, holidays, call (415) 499-9464 and request to speak with the Public Health Officer on call. For other CDPH Recommendations for Influenza Testing and Reporting, 2013-2014, go to:


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