Dr. Ben Kruskal, Director of Infection Control at Harvard Vanguard Medical Associates: Conversation with David Harlow about H1N1
The kids are back in school and it's time to pick up the H1N1 conversation with Ben Kruskal, MD, PhD, Director of Infection Control at Harvard Vanguard Medical Associates. In today's installment, we look ahead to the fall and winter, and discuss the planning that will see us through the season. Dr. Kruskal touches on H1N1 crowding out seasonal flu in the southern hemisphere during its winter season, and on the likelihood that H1N1 vaccines will only require a single dose, and not two, as had been anticipated.
Our conversation runs about 15 minutes and is available for download/podcast.
Update 9/20/09: The transcript of my conversation with Dr. Ben Kruskal about H1N1 is available at the link and below.
Interview of Ben Kruskal, MD, PhDDirector of Infection Control of Harvard Vanguard Medical Associates
September 17, 2009
David Harlow: This is David Harlow on HealthBlawg, and I’m
speaking today with Dr. Ben Kruskal,
Director of Infection Control of Harvard Vanguard Medical Associates. Hello Ben, how are you?
Ben Kruskal: I’m very well, David. How are you?
David Harlow: Very well, thank you. So, Ben, we last spoke in the spring as people were just trying to get a handle on swine flu, as the infection was spreading, and as various groups were trying to get ahead of swine flue. So here we are 4, 5 months later and I’m interested to hear: From your perspective, have things gone as you might have expected 4, 5 months ago?
Ben Kruskal: I would say they have. We continued to see some H1N1 disease gradually winding down from the spring through the summer, things were quite quiet through the summer and are still relatively quiet, although we’re just beginning to get the intimation of maybe things ticking up again.
David Harlow: OK. I
was looking at some Massachusetts Department of Public Health figures and it
looked like there was a bit of a spike in late May/early June, does that track
with anything that you saw?
Ben Kruskal: That’s exactly right. What we saw was seasonal flu winding down
through April and then at the end of April and beginning of May, a big spike
well above the normal levels for that time, with a gradual trail coming down
through May, June and trailing of back to sort of true in between season levels
in the middle of July or so.
David Harlow: Okay, so as we look ahead to the following school
year, here we are end of summer, college kids are back at school, school kids
are back at school, have you seen any uptick in cases what with folks back into
school and back in closed quarters with other young folks?
Ben Kruskal: We’re not seeing a whole lot of cases here yet
but there are certainly reports from all over the country of some outbreaks,
localized particularly in the college and the university world.
David Harlow: Do you attribute that to a dumb luck or has
there something else been going on locally that may be helping in mitigating
Ben Kruskal: I don’t know that there is anything we can
easily attribute it to. I know that there has been some earlier activity in the
southeast which may have something to do with an earlier start to the school
year for school age kids, they start a week or two at least before we do, so
that may explain some of it.
David Harlow: Right, so we may see that on a rolling basis,
just as school gets underway.
Ben Kruskal: Exactly.
David Harlow: So we’re looking forward to seeing a vaccine
in the near future and I’m wondering whether you can tell us anything about the
vaccine, and about whether there has been any change in characteristics of the
virus overtime. And also – again, back to
the vaccine - there has been varying information about whether people will need
one dose or two for the H1N1 vaccine.
Ben Kruskal: Well, let me speak first to the issue of the virus
changing. Buy and large, it seems to be
fairly stable in its behavior through the flu season in the southern hemisphere.
Most of the reports were that it was very similar to what we had seen here. There
are a few locales where there has been a higher proportion of severe disease,
just as it was in Mexico in the very beginning of the outbreak, and we really
don’t understand why that is the case.
David Harlow: Have any theories been floated or any ideas
about why some people are hit harder by this?
Ben Kruskal: There are a few theories out there. One is that the areas that are harder hit may
have populations with particular genetic susceptibility to the virus. Another possibility is that in certain locales
there are other microbial pathogens, other co-infections that could potentiate
the H1N1 and cause it to become more severe.
Yet another theory is it relates to lower immune defense because of
malnutrition. I don’t think that theory
flies quite so well as the others because it really doesn’t correlate terribly
well. The severity of disease doesn’t
correlate terribly well with economic indicators.
David Harlow: So we’re looking forward now to the fall and winter
and looking at H1N1 layered on top of the seasonal flu; would you expect there
to be a more severe flu season because of the added ingredient to the H1N1?
David Harlow: Interesting, so it’s sort of crowded out others?
Ben Kruskal: Right and that’s been a feature of previous
pandemics as well, so it’s not entirely surprising. So what we anticipate, most likely, is that
we will have an H1N1 outbreak - it will last as long as it lasts. It will quite likely occur earlier than
typical flu season and hopefully after that’s over, it will be over and we
won’t have any more flu for another year.
David Harlow: Right, but in the meantime, there has been a
lot of contingency planning done both by health care providers, schools, employers
even looking forward to what they can do to mitigate interruptions in
operations in case there is greater incidence of this flu. Are there any particular plans that you can
point to that seem to be well thought out and executed on the health care front?
Thinking particularly about the issue of
vaccinating health care workers, I remember reading in the past few weeks about
some health care providers who have said that they don’t want to be inoculated
and I’m wondering whether that is something that should be left to the
Ben Kruskal: Well, you have to probably start with the
trends in seasonal flu vaccination for health care workers. Flu is a relatively unusual virus in that it’s
serious enough to cause disease that’s quite a problem for many patients but it’s
not serious enough that everybody who gets it won’t come to work. So if you have dedicated health care workers
who get sick and still get into work, so they don’t strand their coworkers and
their patients, they are infecting their patients. And so as a result there has been a strong
move over the past 5 years or so to increase health care worker vaccination
against seasonal flu and actually in many health care organizations that’s made
a requirement of employment and that’s a trend that has been accelerating
rapidly with the H1N1 outbreak. For
example, here in Massachusetts, the Commissioner of Public Health issued a
public health order mandating that all health care organizations offer seasonal
flu vaccination and pandemic flu vaccination when relevant to all of their
staff and that staff who don’t want that vaccine have to actively decline.
David Harlow: That stops short of mandating it, so someone
could still decline the inoculation and come to work.
David Harlow: Other than the Department of Public Health
Commissioner’s order there has been a lot of activity at the Department of
Public Health and I’m wondering if you could comment on some of the other
actions taken there and whether those have been moving things forward in your
Ben Kruskal: I think so; I think Massachusetts is ahead of
many states in terms of pandemic planning.
The Department of Public Health has been working on this for at least 8
or 9 years and as a result I think we have plans that are considerably more
mature than in many other areas of the country.
That being said, you still want to be fully prepared but the Department
I think has been coping very, very well and really is serving something of a
model for other states.
David Harlow: Could you give us an example of one of the
parameters along which the Department has done some good advanced planning or
perhaps something from your experience at Harvard Vanguard?
Ben Kruskal: Well, I think the Department has done very
well establishing communications channels both to healthcare providers and to
the general public. They set up the
211-information line. They have made
epidemiologists available to answer questions during the outbreak; they really
staffed their communication center quite heavily so that people were
available. They were holding frequent
conference calls with various constituencies to keep us up-to-date. They worked very, very hard at communicating
and I think they did a very successful job of it.
David Harlow: As you’re mentioning these various items I’m
remembering that Dr. Al DiMaria, the
state epidemiologist, also put up a YouTube video on how to wash hands.
Ben Kruskal: Absolutely.
David Harlow: So they are really firing on all cylinders
Ben Kruskal: That’s right.
David Harlow: Are there other areas of concern that you see
ahead of us? We were talking about
health care workers refusing inoculations, are there other potential areas of
concern that we need to be thinking about?
Ben Kruskal: I think we need to be really focusing
everyone’s attention - both health care’s attention and the public’s attention -
on basic infection control measures. And
washing hands because, juvenile as it may seem, really is a major contributor
to decreasing transmission of many respiratory illnesses. And there have been several studies in the
last few years that have really demonstrated a clear impact of improved hand
hygiene on transmission, for example within a household.
David Harlow: Okay, and that’s something that’s easy to do
and have a real impact.
Ben Kruskal: Exactly.
You don’t need a college degree.
David Harlow: Anything else that you would like to
highlight as we continue this experience?
Ben Kruskal: You raised some questions earlier about the
vaccine, which we really haven’t gotten to.
The vaccine in the early trials that have been reported performed much
better than expected. Given that it’s a
relatively new strain that most young people have not had any prior exposure to
this strain or related strains and that therefore there is little preexisting
immunity, it was expected that we would need two doses of vaccine, one to sort
of immunologically prime us and a second to give us a full boosting to get
really good levels of antibody. And
surprisingly in all of the major vaccine trials that have been reported in the
last few weeks, a single dose has been sufficient to generate very good levels
of protection - better than many seasonal vaccines. And so we’re feeling very hopeful that we’ll
be able to get a lot more people vaccinated with the supply that we have.
David Harlow: And the supplies are coming in or when are
Ben Kruskal: They are nominally due in around the middle
of October. Secretary of Health and Human Services Sebelius has said that they
may be able to mobilize some doses even a week or two before that. We expect that we will start with small
shipments and gradually swelling shipments and then get a steady supply over a
period of many weeks.
David Harlow: And do you see looming difficulty in getting
folks in to have both the seasonal and H1N1 inoculation?
Ben Kruskal: My experience with seasonal flu has been that
the vaccination rate in any given year depends very heavily on media
attention. And one or two well
publicized cases or especially deaths can really spur vaccination quite a
lot. So I think it’s going to depend an
awful lot on what the public perception is and what the media’s shaping of that
public perception is.
David Harlow: Well, we’ve certainly been hearing a lot about H1N1 and I suppose people will be getting their seasonal flu vaccines as well as a result.
Ben Kruskal: Right, it certainly has generated a larger
than usual interest in seasonal flu vaccine so far this year.
David Harlow: Okay, well thank you very much. I’ve been speaking with Dr. Ben Kruskal, Director of Infection Control of
Harvard Vanguard Medical Associates here in the Boston, Massachusetts
area. Thank you again.
Ben Kruskal: It’s a pleasure David.